Question

stars that have reached stages after the main sequence
o a change little in luminosity & temperature
o b change a lot in luminosity & temperature
o c none of the above
o d do not change in luminosity & temperature

Explanation:

After the main sequence stage, stars undergo significant changes. For example, a star like the Sun will expand into a red - giant (increase in luminosity) and its surface temperature will decrease. These are major changes in both luminosity and temperature.

Answer:

B. change a lot in luminosity & temperature