To avoid plagiarism, you can re-phrase the words, or cite the website as to where you took the information from.
The most common use of the semicolon is to join two independent clauses without using a conjunction like and.
So the answer is
D. Cats can be crazy at night; the moon can set them off.
The answer is
1=D
2=C
3=E
4=B
5=A
6=B
I hope you find this useful :D