The proton-proton chain (a) combines two hydrogen nuclei to produce a single helium nucleus and energy.(b) splits a helium nucleus to produce 4 hydrogen nuclei and energy.(c) is the mechanism that increases the temperature between the photosphere and corona of the sun.(d) is the interactions between protons in earth's atmosphere that produces auroras.(e) produces energy in the core of the sun in the form of gamma-rays, positrons, and neutrinos.

(C) is the mechanism that increases the temperature between the photosphere and corona of the sun.

Explanation:

When a stars is converted from hydrogen to helium then this is known as proton -proton chain reaction.Due to this reaction the temperature between corona of the sun and photosphere increases.The main reason for increasing the temperature is exothermic reaction.

So the option C is correct.

(C) is the mechanism that increases the temperature between the photosphere and corona of the sun.

i think slash and

2b2t

explanation:

2b2t