Petra McCoy Has Developed a Product for Cleaning Grout Called

Petra McCoy has developed a product for cleaning grout called Grout-Chee.Everyone who has tried the product really appreciates how quickly it works,but McCoy is having trouble getting retail stores to carry the product.She has decided to send retailers free samples and use other trade promotions to encourage stores to carry her product.What type of promotional strategy is McCoy using?

A) pull
B) push
C) advertorial
D) kinetic