题目内容：
根据短文内容，回答题。When you were looking for a reliable，honest auto mechanic，how did you find him? Before you went into that restaurant you recently tried，how did you know that it served great food? If you’re like most everyone on the planet，you want to lower your risk of a big ugly surprise so you asked people you trust to refer you to a business they trust．
We all rely on our friends and associates to recommend going-or not going-to a particular business．Marketers call this friend-to-friend endorsement(认可)of a business “Word of mouth advertising”．It is the most powerful form of advertising．It is also the most difficult to create．
When you do a great job for your customers or a rotten job，people are going to talk about your business．Unfortunately，because we humans seem to feel negative emotions more intensely than positive ones，we’re more inclined to tell more of our friends about bad experiences with a business than positive ones．Understand this：Customers believe their own experience．You can’t make them believe that your company is wonderful when they felt they were treated badly．
So，to get positive word-of-mouth going for your business，especially from your demanding customers in this service-based economy，you’ve got to do a really outstanding job for everyone exactly．
And when you do，you build a great reputation．That takes time．But it forges a link with your customers and prospective customers in a way that no advertising and no promotional coupon(优惠券)ever could．
The good news is that because there are so many different businesses chasing after your customers’ money，people want to know whom they can trust．So people are going to be talking about you．Create a free sales force for your business-an army of delighted customers who tell everyone they know how good your company is to do business with．That’s a great antidote(解毒剂)to defection．
What is the main topic of this passage? A．A person should rely on his friends for a business．
B．A good name will bring you money．
C．A company can make customers believe that it’s wonderful．
D．A company should advertise everything to survive．
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