After the previous two university buildings on the site had burned down, it was decided that the new Science Hall should be made as fireproof as possible.
Choices
A
After the previous two university buildings on the site had burned down, it was decided that the new Science Hall should be made as fireproof as possible

B
After the previous two university buildings on the site had burned down, they decided that the new Science Hall should be made as fireproof as possible

C
After the previous two university buildings on the site had burned down, it was decided by them that the new Science Hall should be made as fireproof as possible

D
It was decided that the new Science Hall was as fireproof as possible after the previous two university buildings on the site had burned down
The shift of "as fireproof as possible" to describe the building now rather than in the future changes the meaning of the sentence.
E
After the previous two university buildings on the site had burned down by them, it was decided that the new Science Hall should be made as fireproof as possible


IMO none of the answer choices is correct

OA after some discussion.

Would really appreciate if you explain and justify the reasons behind your choice.