Incorrect: Whereas it had been possible to at least consider the draft proposal of the directors, none of the two options of the final bargaining round were acceptable because of the bulk of the finance stipulated in the fine print depended on output.
Correct: Whereas it had been possible to at least consider the draft proposal of the directors, neither of the two options during the final bargaining round was acceptable because the bulk of the finance stipulated in the fine print depended on output.
The above-mentioned question is from GMAT. This question is based on subject-verb related. But my question is related to preposition, that is,
Why did they use during instead of of?
Is it fine if I use in instead of of?. If so, what is the difference I am making here?