Option 1: Srinivas Ramanujam is not the correct answer. Although he was a renowned mathematician from India, he was not the first Indian to be made a fellow of the Royal Society of London.

Option 2: A.C. Wadia is the correct answer. Ardaseer Cursetjee Wadia, also known as A.C. Wadia, was the first Indian to be made a fellow of the Royal Society of London. He was a geologist and worked extensively in the field of petroleum exploration.

Option 3: C.V. Raman is not the correct answer. Although C.V. Raman was a fellow of the Royal Society and won the Nobel Prize in Physics, he was not the first Indian to be made a fellow of the Royal Society of London.

Option 4: P.C. Mahalanobis is not the correct answer. Prasanta Chandra Mahalanobis was a renowned statistician and founder of the Indian Statistical Institute, but he was not the first Indian to be made a fellow of the Royal Society of London.

In conclusion, the first Indian to be made a fellow of the Royal Society of London was A.C. Wadia.