Which of these sentences is punctuated correctly?

Select one:

AI need to leave for school right now; because I don't have all of my school supplies gathered.
BI need to leave for school right now; but I don't have all of my school supplies gathered.
CI need to leave for school right now; although I don't have all of my school supplies gathered.
DI need to leave for school right now; however, I don't have all of my school supplies gathered.

Verified Answer :

I believe that it is
I need to leave for school right now; however, I don't have all of my school supplies gathered.

however most of the time it indicates a semicolon. I hoped I helped ☺

Answer:

d. I need to leave for school right now; however, I don't have all of my school supplies gathered.

Explanation:

However in this case is used to as a conjunctive adverb so a semicolon is required before "however" in order to show there are two different sentences conjoined by an adverb. The first sentence is a fully independent clause that's why it is required a semicolon to separate it from the other clause. Then, after however it is required a comma.