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.

C

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

Because the word "however" is being used as an interrupter in the sentence, it should be set off by commas on both sides.

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

To identify the sentence that is correctly punctuated, we need to analyze the punctuation marks used in each option.

Option A: It is not always necessary; however, to check the entire set of books.
This option uses a semicolon (;) to separate the clauses. However, the word "however" should be followed by a comma when used as a conjunctive adverb.

Option B: It is not always necessary, however; to check the entire set of books.
This option uses a comma (,) before the conjunctive adverb "however." However, a comma is not needed after "however" in this case.

Option C: It is not always necessary, however, to check the entire set of books.
This option uses a comma (,) before and after the conjunctive adverb "however." This is the correct use of punctuation in this sentence.

Option D: It is not always necessary however, to check the entire set of books.
This option is missing a comma after the conjunctive adverb "however."

Based on the analysis, the sentence that is correctly punctuated is Option C: It is not always necessary, however, to check the entire set of books.