In science class, students drip wax on a copper rod at every centimeter of the rods length. When the wax is solid, the students place one end of the rod on a hot plate. The students use a stopwatch to record the amount of time that passes before each drop of wax starts to melt.

Which process are the students most likely investigating?
A. conduction of heat through the rod
B. convection of heat from the rod to the wax
C. transformation of metal in the rod into heat energy
D. radiation of heat from the hot plate to air around the rod

A. conduction of heat through the rod