The correct option is C The one at Nalanda is 7 ½ feet high, whereas the one at Sultangaj is 18 feet high.
There is a difference between the Buddha statue at Nalanda and that discovered at Sultanganj. The one at Nalanda is 7 ½ feet high, whereas the one at Sultangaj is 18 feet high. These are proofs of metallurgical advancements in ancient India.