[問題]新PP-TEST1

[singingsong]

The company has announced that it will purchase the color-printing division of a rival company for $950 million, which is part of a deal that will make it the largest manufacturer in the office color-printing market.
(A) million, which is part of a deal that will make
(B) milion, a part of a deal that makes
(C)million, part of a deal making
(D) million as a part of a deal to make
(E) million as part of a deal that will make

answer: E

可是不太懂為什麼,覺得D似乎也應該可以..
請幫忙解惑~~~

[吳]

The company has announced that it will purchase the color-printing division of a rival company for $950 million, which is part of a deal that will make it the largest manufacturer in the office color-printing market.
(A) million, which is part of a deal that will make
(B) milion, a part of a deal that makes
(C)million, part of a deal making
(D) million as a part of a deal to make
(E) million as part of a deal that will make

d. purchase..to make
e. purchase..that

watch out the original sentence: what "that" means?
d.only this purchase can make it the largest
e.a deal can make it the largest

[jungtsu]

在這邊part of 跟 a part of 有什麼差?
另外，為什麼一定要用as呢?
part of deal直接做同位語不行嗎?