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

This SC can be solved by either focusing on some rather specific verb rules OR by focusing on the "intent" of the sentence. I chose the second option, which allowed me to quickly eliminate all 4 wrong answers.

1) Intent: Experiments, by definition, are about cause-and-effect. For example, if you experiment by taking a diet drug, then how much weight will you lose? The experiment is run to investigate the EFFECT. This SC describes a "series of experiments….." There's only
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