What kind of stars make up the halo?
a. old, metal-rich stars
b. old, metal-poor stars
c. young, metal-rich stars
d. young, metal-poor stars

The correct answer is Option B.

Explanation:

Halo is defined as the region in galaxy in which stars are scattered thinly. They contain globular clusters of stars. This region is surrounded by tenuous gas.

This region is formed by the old stars and these stars are known to be metal deprived and contain mostly primary elements.

Hence, the correct answer is Option B.

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