Unilever Hired a Promotional Marketing Firm to Pass Out Lever

Unilever hired a promotional marketing firm to pass out Lever 2000 hand wipes in food courts and petting zoos.This is an example of:

A) point-of-use sampling.
B) point-of-sale sampling.
C) point-of-dirt sampling.
D) point-of-event sampling.
E) point-of-work sampling.