Which of the following word groups is punctuated correctly?

a)It rained every day of our vacation nevertheless, we had a wonderful time.

b)It rained every day of our vacation, nevertheless, we had a wonderful time.

c)It rained every day of our vacation, nevertheless; we had a wonderful time.

d)It rained every day of our vacation; nevertheless, we had a wonderful time.

The correct answer is option (d) "It rained every day of our vacation; nevertheless, we had a wonderful time."

In this sentence, the semicolon is used to separate two independent clauses: "It rained every day of our vacation" and "nevertheless, we had a wonderful time." The semicolon is used instead of a comma to show a stronger separation between the two clauses. Additionally, the comma after "nevertheless" is used to set off an introductory word or phrase.