What do conduction and convection have in common? A. They can both involve the transfer of thermal energy from one material to another.
B. They can both occur in solids, liquids and gases.
C. They both tend to produce currents.
D. They both involve the movement of particles.

I believe the answer is "A. They can both involve the transfer of thermal energy from one material to another."

i think this picture will you.

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.