Hurray, we finished our invention!
This is the interjection because it says the feelings of the speaker.
B. False
This is because the ones mentioned are sort of like purposes of the conversations.
Hyperbole is an exaggeration. Like, "She broke every bone in his body," when she only snapped his wrist. The hyperbole is that the person thinks of the reader millions of times. They obviously didn't think of you that many times, but it's exaggerated, so it's hyperbole.