GMAT Sentence Correction (SC) | Re: It was not long after the 1930s commenced that such baritone

A. It was not long after the 1930s commenced that such baritone singers as Bing Crosby and Russ Columbo contributed to – Correct

B. Not long after the commencement of the decade of the 1930s, baritone singers such as Bing Crosby and also Russ Columbo decided to contribute in – Their work contributed to something. Decided to contribute in - brings in a subtle change of meaning. X and also Y seems odd.

C. Not long after the 1930s commenced, baritone singers like Bing Crosby and Russ Columbo
...

---