Question

A star's apparent magnitude is most closely related to which of the following? Select all that apply.

a. radius.
b. luminosity.
c. distance from Earth.
d. absolute magnitude. E. surface temperature.

Answer 1

If you want the "most", then you can't have more than one.

A star's apparent magnitude is determined by both its intrinsic luminosity
and its distance from us.

Answer 2

Luminosity

Step-by-step explanation:

The apparent magnitude is a measure of the star's apparent luminosity, the apparent luminosity is directly related to the star's apparent magnitude.

The star's luminosity is the measure of the star's brightness and this diminishes with distance, the luminosity of a star also depends on the size of the star, this means that a star's magnitude and luminosity are directly related.