Abel's brother was Cain. Cain was jealous that Abel's gift to the Lord was better than his. The reason that is was better was because Abel gave the Lord his best of everything. He wanted to give God the most, because he loved God. Cain however, just wanted to get by and give God whatever he wanted. God accepted Abel's gift because it actually came from the heart of Abel. God did not accept Cains gift. Cain was mad because of this and decided to go out the the field with Abel. There, he killed Abel out of anger and jealousy.
Welp, the kid appears to have pawned his work off on his friends, but who knows, if it's a multi-choice question I can't really help because you don't have the answers here.