Sentence Correction

Give it a try. OAs to follow soon and some discussion. Good Luck.

1. The court order's requirement that each transit worker return to work was generally ignored.
(A) that each transit worker return to work
(B) that each transit worker would return to work
(C) that each transit worker should return to work
(D) for each transit worker to return to work
(E) that each transit worker returns to work

2. Having discovered the Roman aristocrats to be suffering from lead poisoning, it is now thought that this was a major cause of their inability to reproduce.
(A) Having discovered the Roman aristocrats to be suffering from lead poisoning,
(B) To have discovered the Roman aristocrats to be suffering from lead poisoning,
(C) Since scientists have discovered that the Roman aristocrats suffered from lead poisoning,
(D) Since the suffering of lead poisoning by Roman aristocrats was discovered by scientists,
(E) Due to the fact Roman aristocrats were suffering from lead poisoning was discovered by scientists,

3. In light of the increasing evidence of the complexity of the body's immune system, they now realize that their approach to finding a cure for cancer has been too simplistic.
(A) they now realize that their approach to finding a cure for cancer has been too simplistic.
(B) scientists now realize that their approach to finding a cure for cancer has been too simplistic.
(C) it is now realized that the approach at curing cancer was too simplistic in their approach.
(D) approaches by them at curing cancer have been too simplistic.
(E) they now realize that their approaches to curing cancer has been too simplistic.