The bright blue leather bag
#4 would be your answer, because he's being tested against all of these forces
He tried to stop quirrell from getting the stone but fluffy the 3 headed dog bite him
1-B, 2-A, 3-B, 4-B, 5-A, 6-B, 7-A, 8-B, 9-A, 10-A, 11-B, 12-A, 13-B, 14-A, 15-B, 16-A, 17-A, 18-B, 19-A, 20-B