YOU SAID:

ok whos idea was this

INTO JAPANESE

誰の考えはこれだったかOK

BACK INTO ENGLISH

who's idea is this ok

INTO JAPANESE

誰の考えは、このOKです

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who's idea this is ok

INTO JAPANESE

誰が考えている、これは大丈夫です

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who's thinking this is okay

INTO JAPANESE

誰がこれが大丈夫だと思っている

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who thinks this is okay

INTO JAPANESE

誰がこれが大丈夫だと思う

BACK INTO ENGLISH

who thinks this is okay