Answer:
The answer is: C. the star must be close enough to the Sun to show measurable parallax.
Step-by-step explanation:
In the field of astronomy, parallax is called stellar parallax in distant stars.
The stars for which parallax measurements have been made are those that are relatively close to the sun on the galactic scale.
The answer is: C. the star must be close enough to the Sun to show measurable parallax.