Dr. Russel’s hypothesis
of the teeth belonging to an extinct animal was verified by comparing the findings with large teeth and bone specimens at the Hunterian Museum of the Royal College of Surgeons in England.A. of the teeth belonging to an extinct animal was verified by comparing the findings with large teeth and bone specimens at the Hunterian Museum of the Royal College of Surgeons in England
B. of the teeth belonging to an extinct animal was verified through a comparison with findings with large teeth and bone specimens at England’s Hunterian Museum of the Royal College of Surgeons.
C. that the teeth they found belonged to an extinct animal was verified by comparing the findings with large teeth and bone specimens at the Hunterian Museum of the Royal College of Surgeons in England
D. which was that the teeth belonged to an extinct animal, was verified by comparing the findings with large teeth and bone specimens at England’s Hunterian Museum of the Royal College of Surgeons.
E. which was verified by comparing the findings with large teeth and bone specimens at the Hunterian Museum of the Royal College of Surgeons in England, was that
the teeth belonged to an extinct animal
I am not sure what "they" refers in C. to me E looks better. Can someone help.
Source is a PDF file of 265 sentence correction questions I downloaded from the this forum.