If he would drink more milk, his health would have been better.

1. A Option A: If he would drink more milk, his health would have been better.
2. B Option B: If he had drank more milk, his health would have been better.
3. C Option C: If he had he drunk more milk, his health would have been better.
4. D Option D: If he had drunk more milk, his health would have been better.

How we write and check questions