There is an ambiguity in the sentence “He is a hard businessman”

There is an ambiguity in the sentence “He is a hard businessman” due to （）.
A、polysemy
B、homonymy
C、synonymy
D、antonymy
【正确答案】：A
【题目解析】：这个句子可能会产生歧义，因为hard这个词有多个意思，例如“严厉的，努力的”