What one physical property determines a star’s temperature, radius, and luminosity while it is on the main sequence?
select one:
a. mass
b. magnetism
c. chemical composition
d. location in the galaxy

a. Mass

Explanation:

The relation between the physical properties , luminosity and mass , is given by the formula -

L = M ^ 3.5

In which ,

L represents luminosity

and

M represents  mass.

Hence , from the above formula ,

mass and luminosity are directly proportional to each other , i.e. ,

by decreasing the mass , the luminosity decreases

and by increasing the mass , the luminosity increases

higher luminosity means , higher temperature , and , in case the star has higher mass , its radius will also increase .