What explains the difference between retail and commercial banking?

What explains the difference between retail and commercial banking?

A) Commercial banks loan money to small businesses, while retail banks loan money to large corporations.

B) Retail banks loan money to small businesses, while commercial banks loan money to large corporations.

C) Commercial banks help small businesses make capital purchases, while retail banks help big businesses invest.

D) Retail banks help big businesses make capital purchases, while commercial banks help consumers invest.