Among his many achievements was the invention of the reflecting telescope the basic design behind all large telescopes

[BTGmoderatorDC]

Among his many achievements was the invention of the reflecting telescope the basic design behind all large telescopes used today, the creation and explanation of his three laws of motion, and the development of the law of universal gravitation.

(A) Among his many achievements was
(B) Among his many achievements were
(C) Of his many achievements, was
(D) Of his many achievements, were
(E) Of his many achievements, are


OA B

Source: e-GMAT