Which of the Following Is the Best Example of a Consumer

Which of the following is the best example of a consumer making a final purchase decision based on information found through social media?

A) Emon is trying to decide between the u-JAYS and the comparably priced Audio Technica headphones, so he turns to Twitter to ask friends for their input.
B) Ji-hoon is excited to find a YouTube video of a group blind test comparing eight different brands of headphones, a few of which he's never even heard of.
C) On Facebook, Kelly reads a debate among her friends about the pros and cons of Beats by Dre headphones.
D) After reading reviews in an online electronics forum, Matt places an order for a pair of Sony MDR-1A headphones from BestBuy.com.