When baking, the rods in an oven heat up and turn red. This is an example of *

A. an object emitting conduction as its thermal boundary layer is above 0°C.
B. an object emitting radiation as its thermal boundary layer is above 0°C.
C. an object emitting radiation as its temperature is above 0°C.
D. an object emitting conduction as its temperature is above 0°C