What Is the Point of Difference Between Illegal Gratuity and Bribery

What is the point of difference between illegal gratuity and bribery scheme?

A) Compared to illegal gratuities, briberies occur relatively infrequently and are usually quite small.
B) Illegal gratuities do not necessarily involve an intent to influence a business decision but rather to reward someone for making a favorable decision.
C) Illegal gratuities usually involve the use of actual or threatened force, fear, or economic duress.
D) Illegal gratuities are made before deals are approved.