NEET 2023 Chemistry question on Chemical Thermodynamics

1. A.
   $\Delta H = \Delta U - \Delta n_g RT$
2. B.
   $\Delta H = \Delta U + \Delta n_g RT$
3. C.
   $\Delta H - \Delta U = -nRT$
4. D.
   $\Delta H + \Delta U = nR$

[NEET 2023]