The correct answer is D) all of the choices are correct.
Chandragupta Maurya had to overcome the following challenges to unite India: There were more than 1,000 different languages in India, there were dozens of small kingdoms in India, and he had to fight one of Alexander the Great's generals.
As the founder of the Maurya empire, Chandragupta Maurya had to overcome many obstacles in order to unite India. With the advice of his Chief Minister, Chanakya, he controlled the empire, built a strong army and conquered new territories. He was a good ruler and left important works of infrastructure such as roads, mines, temples, and irrigation services. He had a solid central government that was good for that time and allowed the empire to prosper.