PLSSS SOMEONE HELP ME!! I don't need the answer, I just need to know if this math problem is correct or not, because I'm not completely sure if it's correct, as my teacher marked it wrong, but didn't write the correct one. Here is the file:

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d

shorter then the tree

is there any answers choices? l can try to you if there is answer choices to this question,so sorry