The cowboy found some bones

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The cowboy found some bones

by BTGmoderatorDC » Mon Feb 19, 2018 8:28 pm
The cowboy found some bones, proving to be of an ancient bison.

(A) bones, proving to be of
(B) bones that proved to be those of
(C) bones, which proved to be of
(D) bones, proving to be that of
(E) bones, which is proved those of

What is wrong with other options, can some experts explain?

OA C