The correct answer is C) leaking door gaskets. Explanation: If the refrigerated space temperature is slightly above normal but never reaches the desired minimum temperature, and the suction and discharge pressures are normal, it suggests that the refrigeration system is operating correctly. In this scenario, the issue is likely due to heat infiltration from outside the refrigerated space, which would be caused by leaking door gaskets. Properly sealing the door gaskets is crucial to maintaining the desired temperature within the refrigerated space. The other options are incorrect because: A) high cooling water temperature would affect the discharge pressure, B) a shortage of refrigerant would cause low suction pressure, and D) air in the system would result in abnormal pressures.