Answer:
B. It included mathematical equations that explained and predicted the movement of the sun and the moon.
Step-by-step explanation:
By the 17th century, the astronomers had already realized that the Earth was a planet and it revolves around the sun. In Newton´s time, everything known about the movement of the planets around the sun was summarized in the three laws of motion by Johannes Kelper. But these laws explained what happened with no explanation of the why.
Newton wanted to prove that all the planets, including the Earth, obey to a unique set of physical laws, an invisible force that made the planets act in a certain way. He develops a mathematical equation that explained the motion of the planets. The equation explained the gravity, whether it was to the movement of the planets or to a tinny thing like the falling of an apple from a three. By doing this Newton prove that the Kelper´s laws were correct.
I hope this answer helps you.