Answer:
The correct answer is - the star is a medium-size star.
Explanation:
On the basis of the given information, we know that the color of the sun and the color of the observed or studied star by astronomer is similar and on the basis of this observation, he stated that the temperature and the size of the sun is also similar.
As we know the size of the sun is medium in comparison to other star and have less temperature to the other stars which means it is cooler than other star and has a medium size.
