Identify the sentence that is correctly punctuated.

A. It is not always necessary; however, to check the entire set of books.
B. It is not always necessary, however; to check the entire set of books.
C. It is not always necessary, however, to check the entire set of books.
D. It is not always necessary however, to check the entire set of books.
D

Nope.

To identify the sentence that is correctly punctuated, we need to review the rules for punctuating with conjunctions and transitional words. In this case, the transitional word "however" is being used to indicate a contrast or exception.

The correct punctuation in this context should be a comma before and after the transitional word "however."

Let's review the options:

A. It is not always necessary; however, to check the entire set of books. Incorrect. There's no comma before "however."

B. It is not always necessary, however; to check the entire set of books. Incorrect. There's a comma after "however," but not before it.

C. It is not always necessary, however, to check the entire set of books. Correct. There is a comma before and after "however," indicating the correct punctuation.

D. It is not always necessary however, to check the entire set of books. Incorrect. There's no comma after "however."

Therefore, the sentence that is correctly punctuated is option C: "It is not always necessary, however, to check the entire set of books."