The correct options are
A Inscriptions are the most important of all archaeological sources.
B Monuments are the second most important archaeological source.
C Coins are the third most important archaeological source.
Inscriptions are the most important archaeological source. They provide valuable historical facts and rich information about a particular era. Monuments are the second most important archaeological source. They serve as repositories of information for medieval India. Coins are the third most important archaeological source. They throw light on important historical dates, events and personalities.