Which of these sentences is punctuated correctly?
I need to leave for school right now; because I don't have all of my school supplies gathered.
I need to leave for school right now; but I don't have all of my school supplies gathered.
I need to leave for school right now; although I don't have all of my school supplies gathered.
I need to leave for school right now; however, I don't have all of my school supplies gathered.