What happened at point C to end with D?

a
The surrounding air transferred thermal energy to A and B to equalize both in D. Air is the best conductor of heat.
b
A transferred thermal energy to B to equalize both in D. Warmer always moves toward colder areas.
c
B transferred thermal energy to A to equalize both in D. Cold always moves toward warmer areas.
d
This scenario can only be possible in a controlled setting in lab.

1 answer

Based on the information provided, none of the options seem to accurately explain what happened at point C to end with D. Without additional information, it is impossible to provide a correct answer.