Choose the correct reported sentence.
Betty said, "When I know the answer, I will call you.”

Question

Choose the correct reported sentence. 
 Betty said, "When I know the answer, I will call you.”

Accepted Answer

Betty promised to call me when she knew the answer.

Answer

Betty told me  that she will call me when she knows the answer.

Answer

Betty told me  that she would call me when she would  know the answer.

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