Which of the Following Is the Best Example of a Consumer

Which of the following is the best example of a consumer discovering goods and services through social media?

A) Stacy reads her friend Carol Ann's post praising the new Yoplait Oui French-style yogurt.
B) Max asks his online friends to tell him which brand of Greek yogurt they like best.
C) Kai sees a downloadable coupon for her favorite type of Dannon yogurt and adds it to her shopping list.
D) Doug pins a recipe for yogurt-based salad dressing.