At what temperature are food items kept fresh in a refrigerator?

The temperature maintained in a refrigerator for food preservation is scientifically significant. Storing food at exactly 0°C risks freezing the food. While 0°C slows bacterial growth significantly, the image specifically gives 4°C as the safe refrigerator temperature. The standard safe refrigerator temperature is 4°C (40°F). At this temperature, bacterial growth is significantly slowed (most bacteria grow optimally between 4°C and 60°C — the danger zone). Additionally, 4°C is significant because it is the temperature of maximum density of water (water is densest at 4°C). Option C (10°C) is incorrect — 10°C is too warm for safe food storage. At this temperature, bacterial growth occurs rapidly. This is the temperature of a wine cooler or root cellar, not a standard refrigerator. Option D (-18°C) is incorrect — -18°C is the standard temperature for a FREEZER compartment, not the main refrigerator section. At -18°C, food freezes solid.