Concept:Commercial banks mainly accept deposits and give out loans to customers.
Explanation:Commercial banks receive deposits such as savings, current, and fixed deposits from the public.
They use these funds to provide loans and advances to individuals and businesses.
They also offer overdrafts, discount bills of exchange, and safe custody services.
However, maintaining stable prices and regulating monetary policy are functions of the central bank.
Issuing bank notes and coins is also the central bank’s duty in most economies.
Thus, the key function of a commercial bank from the options given is granting loans to customers.
Answer:C. granting loans to customers.