What is the change in longitudinal moments for the Coastal Driller if 2.5 feet of drill water is discharged from drill water tank 23?

Correct Answer: Option D — -20,052 ft-kips

Discharging weight from a specific longitudinal position reduces the total longitudinal moment by the product of the discharged weight and its arm. Discharging 2.5 feet from tank 23 results in a longitudinal moment change of -20,052 ft-kips based on tank capacity tables.