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 a very kind-hearted and sincere person.
B、Forrest is pure and simple-minded.
C、Forrest is so stupid that he always does something wrong.
D、Forrest is a man of his words.
正确答案：Forrest is so stupid that he always does something wrong.