In the United States, the Giving of Gifts in the Workplace

In the United States, the giving of gifts in the workplace is most likely to be interpreted as

A) a form of bribery, an attempt to buy influence.
B) an expression of one's gratitude toward the receiver.
C) being customary and, hence, an acceptable behavior.
D) a charge on the corporate account and, hence, a tax-deductible expense.