Correct Option: B

Elephants were always part of warfare in India. However, it were the rulers of Magadha who first employed elephants as a weapon of large-scale destruction. According to Plutarch, at the time of Alexander’s invasion of India, the Nanda army comprised 6,000 war elephants which discouraged Alexander’s men from further advancement. According to Megasthenes, Chandragupta Maurya’s army consisted of 9,000 war elephants.