An H-R Diagram for a Globular Cluster Will Show a Horizontal

An H-R diagram for a globular cluster will show a horizontal branch-a line of stars above the main-sequence but to the left of the subgiants and red giants.Which of the following statements about these horizontal branch stars is true?

A) They have inert (non-burning) carbon cores.
B) Their sole source of energy is hydrogen shell burning.
C) They generate energy through both hydrogen fusion and helium fusion.
D) In a particular star cluster,all horizontal branch stars have the same spectral type.

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