GWD-3-Q3到底答案是哪个？

Almost a decade after New York State passed laws to protect patients by reducing the grueling hours worked by medical residents, twelve hospitals have been investigated by state medical officials, finding that all twelve consistently break the laws, many residents work longer than 24 hours straight, and that more than half the surgical residents work more than 95 hours a week.

A. twelve hospitals have been investigated by state medical officials, finding that all twelve consistentlt break the laws, many resident work longer than 24 hours straight, and that more than half the surgical residents work.

B.an investigation by state medical officials of twelve hospitals have found all twelve consistently breaking the laws, that many residents work longer than 24 hours straight, with more than half the surgical residents working

C.an investigation of twelve hospitals by state medical officials has found that all twelve consistently break the laws, that many residents work longer 24 hours straight, and that more than half the surgical residents work.

D.twelve hospitals were investigated by state medical officials who found all twelve breaking the laws, with many residents working longer than 24 hours straight, and more than half the surgical residents work.

E.an investigation by state medical officials has found that, of twelve hospitals, all twelve consistently break the laws, that many residents work longer than 24 hours straight. with more than half the surgical residents working.

到底答案是C还是D啊？

found that ...that ...that..但是答案怎么写的是C啊？到底是哪个啊？