What is the turnoff point for a star cluster?
A) a point in the Hertzsprung-Russell diagram occupied by stars undergoing (or about to undergo) the helium flash
B) a point in the Hertzsprung-Russell diagram occupied by the highest-mass main-sequence stars in the cluster
C) a point in the Hertzsprung-Russell diagram occupied by the lowest-mass main-sequence stars in the cluster
D) a point in the Hertzsprung-Russell diagram occupied by the highest-mass stars that have not yet reached the main sequence
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