[求助]“取非削弱”和“加强”是怎么区别的？

比如狒狒的80，我觉得BDE都对。。但是为什么只有D是取非削弱，而B和E都是加强呢？

80. Advertisement: Clark brand-name parts are made for cars manufactured in this country. They satisfy all of our government automotive tests-the toughest such tests in the world. With foreign-made parts, you never know which might be reliable and which are cheap look-alikes that are poorly constructed and liable to cost you hundreds of dollars in repairs. Therefore, be smart and insist on brand-name parts by Clark for your car.

The argument requires the assumption that

A.        Clark parts are available only in this country

B.        foreign-made parts are not suitable for cars manufactured in this country

C.        no foreign-made parts satisfy our government standards

D.       parts that satisfy our government standards are not as poorly constructed as cheap foreign made parts

E.        if parts are made for cars manufactured in our country, they are not poorly constructed

这种assumption的题好难啊。。。