Question 1: B

Question 2: D

Question 3: D

Question 4: C

Question 5: C

Question 6: A

Question 7: B

Question 8: A, B, C, D

Question 9: A, C, D, E

Question 10: A, B, D

Question 11: A, B, C, D

Question 12: A, B, C, D

Question 13: A, B, D

Question 14: A, C

Question 15: A, B, C, E

Question 16: B, C, D

Question 17: B, C, D, E

Question 18: B, C, D, E

Question 19: A, B, C, D

Question 20: B, C, D, E