The figure below shows the H-R diagram for the very young cluster NGC 6530.Notice that the main sequence is missing the low-luminosity red tail.At the same time, there are several reddish and yellowish objects to the right of the main sequence (clearly marked) .What could these objects represent? 
A) evolved Sun-like stars
B) planets orbiting other stars
C) red dwarfs
D) red supergiants
E) protostars in the pre-main-sequence stages
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