feifei-80请教下NN

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
arts are not suitable for cars manufactured in this country

C.       
no
foreign-made parts satisfy our government standards

D.      
parts that
satisfy or 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

我想C无疑是个Assumption,对其取非，foreign-made parts satisfy our government standards,明显是个削弱，但这个Assumption似乎是太大了较之于D,没有必要，从经济学的角度，选个成本低的D（D架桥架得很漂亮！）
于是得出结论：架桥优于not+weaken