ERV + TV + IRV + RV is equal to :

Total Lung Capacity.

The correct answer is Option (3) - Total Lung Capacity.

Vital Capacity (VC) is the maximum volume of air a person can breathe in after a forced expiration. This includes ERV, TV and IRV or the maximum volume of air a person can breathe out after a forced inspiration.

Residual Volume (RV) is the volume of air remaining in the lungs even after a forcible expiration. This averages 1100 mL to 1200 mL.

Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of a forced inspiration. This includes RV, ERV, TV and IRV or vital capacity + residual volume.

Expiratory Capacity (EC) is the total volume of air a person can expire after a normal inspiration. This includes tidal volume and expiratory reserve volume (TV+ERV).