Based on Your Knowledge of the H-R Diagram,which of the Descriptions

Based on your knowledge of the H-R diagram,which of the descriptions of a star cluster is astrophysical nonsense?

A) A complete main sequence with no red giants and no white dwarfs
B) A complete main sequence except no O stars,there are some red giants
C) A complete main sequence,no red giants but a large number of white dwarfs
D) No stars of spectral classes O,B,or A,but red giants and white dwarfs

Correct Answer:

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