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Frank studied for two M.A. degrees, and he earned a doctorate before he landed his current post, as a math instructor.

Choose the selection in which the sentence is properly punctuated.
A) NO CHANGE
B) Frank studied for two M.A. degrees, and he earned a doctorate before he landed his current post as a math instructor.
C) Frank studied for two M.A. degrees and he earned a doctorate before he landed his current post, as a math instructor.
D) Frank studied for two M.A. degrees, and he earned a doctorate before he landed his current post; as a math instructor.

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It would be B because you don't need a comma on the last one.
david8644

The answer is:

B) Frank studied for two M.A. degrees, and he earned a doctorate before he landed his current post as a math instructor.

Comas are used to make pauses and separate ideas, in this case the last one does not need to be separated because is easier to understand without the commas.

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