GMAT Sentence Correction (SC) | Re: Historically, the stock market frequently loses money during the summe

Historically, the stock market frequently loses money during the summer months and generally gains value over the winter,so serious investors often withdraw from the stock market in the spring and reinvest in the fall.

(A) so serious investors often withdraw from the stock market in the spring and reinvest in the fall.(Correct)
(B) so the serious investor oftenwithdraw from the stock market in the spring and reinvest in the fall. (The Serious investor is specific. Therefore, it requires singular
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