[求助]补充题213

213.
                    Some historians of science have argued that science moves forward not so much because of the insights of great thinkers but because of more mundane developments, such as improved tools and technologies.

(A) because of the insights of great thinkers but because of

(B) because of the insights of great thinkers as the result of

(C) because of the insights of great thinkers as because of

(D) through the insights of great thinkers but through（C）

(E) through the insights of great thinkers but result from

Could anyone tell why the answer is C, but not A? If C is an idiom, what is the proper format of it? so much because of.... as because of?

so much...as... , whatever is inserted in between