FF-80,求助

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

我觉得C和D 都对,排除不了C,请大家给我好的排除方法和理解方法.