Final answer:
The ideal refrigeration temperature for a reefer varies, but for most fresh produce, 32°F/0°C is standard to prevent freezing while maintaining freshness.
Step-by-step explanation:
The correct temperature to maintain in a reefer, which is a refrigerated shipping container or truck, depends on the goods being transported. If the question pertains to the optimal temperature for fresh produce, option a) 32°F/0°C is typically used to prevent freezing and maintain freshness without causing damage to most refrigerated products. However, it's important to note that different types of goods may require different refrigeration temperatures. For instance, some tropical fruits and vegetables are kept at higher temperatures, such as b) 45°F/7°C.