The electrons in surface atoms of a star require the input of energy in order to move from the ground state. this energy is generated on the surface of the star in the core of the star from other stars nearby from planets orbiting the star

Option B, in the core of the star

Explanation:

All the stars generate energy through the process of nuclear fusion. These nuclear fusion reactions take place with in the core of the star . The pressure with in the core of the star is extremely high which is the main causative factor of nuclear fission reactions.

Since the source of energy lie with in the core of the star, it is sure that  electrons in surface atoms of a star get their energy from the core of the star.

Hence, option B is correct

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