How does solar energy travel through space to Earth?

a. conduction
b. convection
c. radiation

c. radiation

Conduction requires matter in physical contact.
Convection requires a fluid medium.
Since there is neither in space, the only option is radiation.
Of course, researching for yourself what each word means would have given you the answer.

Yep, radiation. Conduction is when two objects touch and energy is transferred, like when a place mat warms up when you put a hot plate on it. Convection is when heat leaves an object, like a hot cup of coffee. Radiation is when energy travels through empty space (not air), such as solar energy.

B radiation is the only way energy can travel through vacuum of space.