Answer:
Option D, Main sequence Stars
Step-by-step explanation:
The stars which are located between the upper left corner and the lower right corner of Hertzsprung - Russell Diagram have high temperatures and high luminosity. For example sun. Sun is a form of main sequence star and thus have have high temperatures and high luminosity.
While giant and red giant stars have low temperature and high luminosity and a super giant has high luminosity but its temperature may vary from low to high temperature.
White dwarfs are stars with high temperature and low luminosity
Thus, among all the given options Option D, is the correct answer.