The correct option is D Nalanda University was equipped with furnace for study and research.
Ancient India saw various developments in the field of chemistry. Some examples of phsyical evidence include the copper statue of Buddha discovered in Bihar which is 7 ½ feet high and weighs a tonne while the statue of Buddha at Nalanda that is 18 feet high. Another example is the Vijay Stambha at Delhi, a 24 feet high iron pillar built by Chandragupta II, that weighs a massive 7 tonnes and has not yet corroded.