A, B, and D begin statements that can stand by themselves logically. C begins a statement that shows how the previous statement and itself are connected. As such, the answer is C(As a result).
I believe it would be the glossary located usually in the back of a book. I hope this helps!
Cappella music is always played with the voices of one singer or others without musical instruments accompanying them. I hope this helps!
<span>stick, attach, or fasten (something) to something else.</span>