Callie and Jeff were investigating the effects of heat on chocolate. Chocolate bar A was left outside in the direct sunlight.

Chocolate bar B was left inside with no direct sunlight.

Which explanation BEST describes what happened to chocolate bar A?
A
Heat was transferred to the chocolate bar by convection causing it to melt.
B
Heat was transferred to the chocolate bar by radiation causing it to melt.
C
Heat was transferred to the chocolate bar by condensation causing it to melt.
D
Heat was transferred to the chocolate bar by evaporation causing it to melt.