How Would You Expect a Star That Formed Recently in the Disk

How would you expect a star that formed recently in the disk of the galaxy to differ from one that formed early in the history of the disk?

A) It should have a higher fraction of elements heavier than hydrogen and helium.
B) It should be higher in mass.
C) It should be much brighter.
D) It should orbit the galactic center at a much higher rate of speed.
E) All of the above would be expected.

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