GMAT Sentence Correction (SC) | Re: In the mid-1920s the Hawthorne Works of the Western Electric

413.In the mid-1920’s the Hawthorne Works of the Western Electric Company was the scene of an intensive series of experiments that would investigate changes in working conditions as to their effects on workers’ performance.

(A) that would investigate changes in working conditions as to their effects on workers’ performance

This happened in the 1920s--would doesn't make sense b/c it happened in the past
(B) investigating the effects that changes in working conditions would have on workers’
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