The correct answer is B) continuous running of the compressor. If a refrigeration system is short of refrigerant, the compressor will run continuously in an attempt to maintain the desired box temperature. This is because the lack of refrigerant reduces the system's ability to absorb heat, causing the compressor to run indefinitely without achieving the necessary cooling effect. The other options are incorrect - a low refrigerant charge would not result in high suction pressure (A), short-cycling due to a water failure switch (C), or high discharge pressure (D), which are typically associated with different refrigeration system issues.