Why Did Manufacturer of Claritin, a Drug for Allergy Sufferers

Why did manufacturer of Claritin, a drug for allergy sufferers that was designed to not make them sleepy, give physicians free samples of the drug?

A) Its formula is similar to other allergy relief medicines currently on the market.
B) Sampling is a way to get rid of excess products.
C) Sampling allows the consumer to try the product risk-free.
D) Trial-size containers are a form of advertising.