He _______ more visits to his parents.He has been regretting not doing so since they passed away.

A. should pay?

B. would pay?

C. should have paid?

D. would have paid?

He _______ more visits to his parents.He has been regretting not doing so since they passed away

1. A.
   should pay
2. B.
   would pay
3. C.
   should have paid
4. D.
   would have paid