问题详情

What does the author mean by saying, at the end of the passage, "There is no silver bullet"(Line 4, Para 7)？
A.There is no single easy quick solution to the problem.
B.There is no hope of success without public cooperation.
C.There is on hurry in finding ways to solve the obesity problem.
D.There is no effective way to reduce people"s sugar consumption.请帮忙给出正确答案和分析，谢谢！