Which of the Following Is an Advantage of the Sampling

Which of the following is an advantage of the sampling method of sales promotion?

A) It is the least expensive of all other methods of sales promotion.
B) The costs of the sampling program can easily be recovered with just a few purchases.
C) Results of sampling could be easily seen immediately for all products.
D) It is extremely useful for products and services that do not have subtle features.
E) Sampling generates much higher trial rates than advertising.