Sentence Correction (SC) | Re: Having discovered the Roman aristocrats to be suffering from lead pois

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)