Sentence Correction (SC) | The company s efforts to seek advance orders for its

The company’s efforts to seek advance orders for its computers will set off an intense new phase with its chief rival, one determined more by how efficiently each company can produce computers than by their visions.

a) one determined more by how efficiently each company can produce computers than by theirvisions.
Correct
Correclty uses the idiom more by X than by Y
b) which will determine more how efficiently each company can produce computers than theirvisions
which modifies the touching noun, hence incorrect