YOU SAID:

I refuse to answer that question on the grounds that I don't know the question.

INTO JAPANESE

私は質問を知らないという理由でその質問に答えることを拒否します。

BACK INTO ENGLISH

I refuse to answer that question because I do not know the question.

INTO JAPANESE

私は質問を知らないので、私はその質問に答えることを拒否します。

BACK INTO ENGLISH

I do not know the question, so I refuse to answer that question.

INTO JAPANESE

私は質問を知らないので、私はその質問に答えることを拒否します。

BACK INTO ENGLISH

I do not know the question, so I refuse to answer that question.