Correct Option: C

Brahmagupta declared the 'Law of Gravity' long before the Newton's Law. The great 7th century Indian mathematician and astronomer Brahmagupta wrote some important works on both mathematics and astronomy. He was from the state of Rajasthan of northwest India (he is often referred to as Bhillamalacharya, the teacher from Bhillamala), and later became the head of the astronomical observatory at Ujjain in central India.