Soal expressing regret

Mother : dina, i heard that you get c mark on english exam
dina : yes mom, i get c mark on english exam. ………………………….
the expression of regret for that is
a. that's no problem, right?
b. i think i will be get a mark from other exam
c. so, forget it mom.
d. i'm so sorry mom
e. but i'am still happy about it
jawaban d