Concept:Commercial banks make most of their money from the banking activities they carry out, especially lending money to customers.
Explanation:A commercial bank accepts deposits from customers and also gives out loans and overdrafts.
The interest charged on these loans is the main source of income for the bank.
Banks also earn money from discounts, commissions, and service charges on banking transactions.
These earnings come from performing the day-to-day functions of banking.
Other activities such as tourism, communication, and transportation are not the primary income earners for commercial banks.
Banking itself is the business through which a commercial bank makes its profit.
Answer:B. Banking.