求助OG紫皮的61题~

61．  Archaeologists in Ireland believe that a recently discovered chalice．which dates from the eighth century, was probably buried to keep from being stolen by invaders．

(A)  to keep from

(B)  to keep it from

(C)  to avoid

(D)  in order that It would avoid

(E)  in order to keep from

Grammatical construction

The phrase to keep from being stolen is incomplete；the reader does not know what might be stolen．Inserting a pronoun makes it clear to the reader that it is the chalice that might be stolen．

A  Pronoun it is needed for clarity．

B  Correct．The sentence is clarified by inserting the word it, which refers back to chalice．

C  Pronoun it is needed for clarity；this suggests the chalice acts to prevent its own theft．

D  Pronoun it is needed for clarity；this suggests the chalice acts to prevent its own theft；in order that it would is wordy．

E  Pronoun it is needed for clarity．

The correct answer is B．

OG里说C中this suggests the chalice acts to prevent its own theft，我不是很懂，avoid不就是避免的意思吗？和keep from doing阻止有什么区别呢？？

请帮忙解释一下吧，大谢~~~