Which interpretation of the sentence “Stupid is as stupid does”；is not true？

Which interpretation of the sentence “Stupid is as stupid does”；is not true？
A.Forrest is pure and simple-mindeD.B.Forrest is so stupid that he always does something wrong.
C.Forrest is a man of his words.
D.Forrest is a very kind-hearted and sincere person.
正确答案：Forrest is so stupid that he always does something wrong.