两道SAT语法题求解答Conners,a publishing and media services company,i

两道SAT语法题求解答
Conners,a publishing and media services company,is
acquiring Dispatch Education,it manufactures school uniforms.
(A)Dispatch Education,it manufactures
(B)Dispatch Education,which manufactures
(C)Dispatch Education,manufacturing
(D)Dispatch Education; it is manufacturing
(E)Dispatch Education; for the manufacturing of
这题答案选B,which在这里指代什么?难道不应该是指代最近的名词吗,但如果指代Dispatch Education,意思就不对了啊,还有为什么不可以选C?
3.Most people know about calories and nutrition,but they do not use this knowledge to lose weight permanently and keep it off.
(A) permanently and keep it off
(B) permanent and have it stay off
(C)and have it be off permanently
(D)and make it permanent
(E)and keep it off permanently
为什么选E不选A?