Choose the sentence with correct structure

A. I don't know what is he doing.

B. I don't know what he is doing.

✓

C. I don't know what doing he is.

D. I don't know what he doing is.

📖 Additional Information

I don't know what is he doing.
I don't know what he is doing.
I don't know what doing he is.
I don't know what he doing is.

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