1-10 answer   CCEED  AAAEE
11-20             ABEDB  AEDCC
21-30             EDDCB  CBBCB
but #17 #19 #24 not so sure ,the % are so close
#17   

E

31%

C

31%

B

13%

#19

C

29%

D

26%

E

18%

#24

C

27%

D

25%

A

23%

there are at least 7800 data , so the other answer pretty sure , I think