XDF Section 1-7

helena220

Stronger patent laws are needed to protect inventions from being pirated. With that protection, manufacturers would be encouraged to invest in the development of new products and technologies. Such investment frequently results in an increase in a manufacturer’s productivity.
Which of the following conclusions can most properly be drawn from the information above?
(A) Stronger patent laws tend to benefit financial institutions as well as manufacturers.
(B) Increased productivity in manufacturing is likely to be accompanied by the creation of more manufacturing jobs.
(C) Manufacturers will decrease investment in the development of new products and technologies unless there are stronger patent laws.
(D) The weakness of current patent laws has been a cause of economic recession.
(E) Stronger patent laws would stimulate improvements in productivity for many manufacturers.
请问答案为什么是E，C为什么不对？

uclb5550

The line of reasoning is that: with law protection_manufactures will invest_with investment_productivity will increase. A causes B, B causes C, so A cuases C, law protection _improvement in productivity. Choice E.

The article says if there are strong laws, Manufacturers will invest, but it doesnot say that manufacturers will not invest if there are not such laws.  Remember, it is a very important rule in both gmat and lsat to accept what barely appear in the article as the only fact.