Philology is a study of:

Languages

The correct answer is Option (1) - Languages

Philology is the study of the history of language, including the historical study of literary texts.

Numismatics is the study or collection of currency, including coins, tokens, paper money, medals and related objects.

Osteology means the study of bones and comprises studies of both human and animal material.

Myology is the science that studies muscles, their physical structure, type of fibers, specific function, and the connections between different muscle groups.