Fill in the blanks with the appropriate words.At the heart of any argument is an issue， which we can define as a question that invites more than one（）answer and thus leads to perplexity or disagreement.

Fill in the blanks with the appropriate words.At the heart of any argument is an issue， which we can define as a question that invites more than one（）answer and thus leads to perplexity or disagreement.
A.fair
B.competitive
C.reasonable
D.unreasonable
正确答案：reasonable