Bruno works in a food processing plant. One of his jobs is to monitor the refrigeration equipment so that all the foods are being stored at a safe temperature. He inspects the thermometers on the 10 refrigerators that hold packaged meat ready for shipment. Which refrigerator needs Bruno’s attention?

A.
the one reading 38°F.

B.
the one reading 37.7°F.

C.
the one reading 40°F.

D.
the one reading 42.8°F.