An exceptional student who mastered calculus at age six and studied particle physics at age ten,
Nora Brodkey's astute scientific mind was vital to the creation of quontronics in the 1970s, when she discovered the fluctuating waves present in deep space.
An exceptional student is noun phrase so we should expect noun that answers "
who is an exceptional student". Therefore A, B and E out.
Consider option D, adjective
vital is in awkward position since "
..., Nora Brodkey was the astute scientific mind vital to the creation of quontronics... " has wrong structure. In additions, you cannot say he/she is
something. "The astute scientific mind" should imply the characteristic of Nora Brodkey since he/she is person, not
scientific mind Hence, C correct.
But you meant OA is C?
a)
Nora Brodkey's astute scientific mind was
b)
it was the astute scientific mind of Nora Brodkey that was
c) Nora Brodkey was the woman whose astute scientific mind wasd) Nora Brodkey
was the astute scientific minde)
the astute scientific mind of Nora Brodkey was