The correct answer is D. He wished that he had the wings of a bird.
The sentence “Oh, that I had the wings of a bird” is an expression of a wish. The speaker is expressing a desire to have the wings of a bird. This could be because the speaker wants to be able to fly, or because the speaker wants to be able to soar through the air like a bird.
Option A is incorrect because the speaker is not proposing to have the wings of a bird. The speaker is simply expressing a wish.
Option B is incorrect because the speaker is not wishing that he might have the wings of a bird. The speaker is wishing that he had the wings of a bird.
Option C is incorrect because the speaker is not wishing that he could have the wings of a bird. The speaker is wishing that he had the wings of a bird.