Question

which processes transfer energy from the core to the photosphere?
radiation, then friction
convection, then conduction
radiation, then convection
conduction, then friction

Explanation:

In the Sun, energy is first transferred from the core to outer - layers by radiation. As it gets closer to the photosphere, the process of convection takes over to transfer energy. Friction is not a significant energy - transfer process in this context, and conduction is not the main process for energy transfer from the core to the photosphere in a star like the Sun.

Answer:

C. radiation, then convection