Questions 151~152 refer to the following news article. 
A coffee vendor from a single-parent family who served as a professional soldier for four years before retiring, has recently gained unexpected popularity after an act of kindness towards a fallen motorcyclist. For the past six months, the vendor has struggled to attract customers at a busy intersection in the city. However, one day, a motorcyclist fell and he quickly rushed to help. Despite the unfortunate incident, the motorcyclist was grateful and wrote a social media post to praise the vendor. The story went viral and was eventually picked up by the news media, leading to long queues of customers waiting to buy coffee from the vendor. The vendor's heartwarming story has touched many and serves as a reminder that small acts of kindness can have a significant impact on others.
【題組】151.According to the news article, how did the vendor gain unexpected popularity?
(A)He fell off his motorcycle.
(B)He wrote a social media post.
(C)He rushed to help a fallen motorcyclist.
(D) He served coffee at a busy intersection.