GMAT Sentence Correction (SC) | In 1871, Charles Darwin published The Descent of Man, and before that,

In 1871, Charles Darwin published The Descent of Man, and before that, Gregor Mendel already had discovered the principles of genetics, using his famous pea plant experiments, and ultimately they would explain and justify Darwin’s conclusions .

(A) In 1871, Charles Darwin publishedThe Descent of Man , and before that, Gregor Mendel already had discovered the principles of genetics, using his famous pea plant experiments, and ultimately they would explain and justify Darwin’s conclusions

(B)
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