What factors can affect the correct operation of a refrigeration system in low ambient temperatures?

The correct answer highlights how low ambient temperatures can lead to increased cycling of a refrigeration system, where the system may turn on and off more frequently. This behavior often occurs because the thermal load on the system decreases in colder weather. As temperatures drop, the refrigeration system may reach the setpoint temperature more quickly and, as a result, switch off. Once the temperature rises above the desired level, the system turns back on again. This cycling can lead to wear and tear on system components and may also impact overall efficiency.

The other factors provided in the options do not appropriately address the situation in low ambient temperatures. Increased compressor speed is not typically relevant to low temperatures, as it might not mitigate issues arising from colder conditions. Enhanced heat rejection capacity generally applies to higher ambient temperatures where the system can dissipate heat more effectively, which is not the case in cooler weather. Decreased refrigerant requirement does not directly relate to the operational challenges posed by lower ambient temperatures as it misrepresents the dynamic of how refrigeration systems function under changing environmental conditions.