Which stars have the highest absolute brightness?
A) Supergiants
B) Giants
C) Yellow stars
D) Dwarfs

Answer:
Supergiants
Explanation:
It has the highest brightness because if you follow up the y-axis on the graph and look at the one with the highest brightness or in this case around 5, it would lead to supergiants.
Also, I just took the test and got it right!