Answer:
B) Repeated attack from the Abbasids.
Step-by-step explanation:
Just for fun, let's make a timeline.
PART 1: - Start -
Babur, who was from Farghana, present-day Uzbekistan, founded the Mughal empire, which lasted for over three centuries. When Babur intended to increase his area but was unable to do so, his empire was destroyed. He was invited to come to Kabul and then Panipat, where he ended the Lodhi dynasty and assumed the title of Indian emperor.
PART 2: - Glory -
His grandson Akbar was the one who actually strengthened and expanded the mughal empire. He grew to the south and east. He established his rule in Afghanistan and made friends with the Rajputs, who served as an empire's solid foundation. The mughal empire was at its height when Shah Jahan built new structures and Jahangir added to the empire's glory.
PART 3: - Beginning of End -
The Mugal Empire was the richest in the world until Aurangzeb overthrew his father, slaughtered his siblings, and assumed the throne. A puritan named Aurangzeb was accused of having the insane intention to turn all of India into an islamic monarchy under the sharia law. He was the richest person in the world during his time, and his empire was as well. India made up 25% of the global GDP. He was the most powerful emperor in charge of the largest continent.
He lacked the foresight of his paternal grandpa Jehangir and the tolerance of his paternal great-grandfather Akbar. He taxed Muslims and Hindus equally, jizia for Hindus, and jakat for Muslims. He had little interest in earthly pleasures, and all of this estranged him from his people. He damaged Shia mosques and Hindu temples, making him despised by both religions. Even though his ancestors had received favors and backing from Shia Iran, he had a very negative attitude against Shia Muslims. He controlled with an iron fist, accepting no one's trust and receiving none himself. Most people dreaded him.
He established numerous fronts for conflict with the Afghans, Marathas, and Sikhs. His prince also rose up in revolt, with the aid of the Rajputs.
The recently established Maratha kingdom Shivaji created turned out to be a pain in his body. After Shivaji's death, he traveled to Maharashtra to overthrow the Maratha state. He was able to arrest their monarch Sambhaji and torture and murder him, but success proved elusive. Previously dispersed Marathas gathered and engaged Aurangzeb in battle with everything they had. The wealthy empire was bankrupt after 27 years of fighting, losing all of its resources and power.
By killing Sikh Guru Teghbahadur, a peaceful Sikh clan was transformed into a warrior clan. Sikhs in Punjab resisted mughal rule under the guidance of Guru Gobind Singh.
There were no immediate family members nearby when Aurangzeb passed away far from Agra. "All along god was with me, but I didn't see him," he said in his final speech as if being led by the divine. He was laid to rest in Aurangabad, where a very plain and unattractive tomb was constructed to reflect his character.
PART 4: - End -
The Marathas rose to prominence starting in 1707, and from that point until the end of the Maratha state in 1818, they controlled who would rule as emperor. Although the name "Maratha Empire" was loosely used, the Maratha Confederacy existed. It was an empire without a monarch, and the Marathas acted as the empire's defenders. It's another story how they accomplished it and what their policy was.
The British empire ruled India from 1857 until 1947 after a revolt forced the end of the Mughal Empire.
Thanks.