Question

Heat will only flow from one object to another ___________. A. if the object receiving the heat is larger B. if the object receiving the heat is denser C. if the object receiving the heat has a higher heat capacity D. if the object receiving the heat is at a lower temperature

Answer 1

There is a probability that heat will flow from higher to lower temperature,
and there is a probability that it will flow from lower to higher temperature. 

The probability that heat will flows from lower to higher temperature is so
small that it is taken to be a law of nature that heat will only flow to the
object that's at a lower temperature.