单选题 What does the last sentence in the 3(上标)rd paragraph mean according to the passage?

A、 The patient is seriously ill because of lack of water in the well.
B、 The patient can be saved if he has enough money to solve the financial problem.
C、 It's too late for small business owners to realize the gravity of the problem because they have used up their money.
D、 It's too late for small business owners to realize the gravity of the problem because they have used up their business.

【正确答案】 C

【答案解析】第三段最后一句：Only when．．．far gone to save．意思是：只有当资金枯竭时，他们才会认识到问题的严重性，只是这时已经太晚了。