Red giant stars are
I.more luminous than the Sun.
II.larger in diameter than the Sun.
III.cooler than B stars.
IV.located above the main-sequence stars in the H-R diagram.

Question

Quizplus · Accepted Answer

Red giant stars are indeed more luminous and larger in diameter than the Sun, making statements I and II correct. They are also cooler than B stars, which are much hotter, making statement III correct. Lastly, in the Hertzsprung-Russell (H-R) diagram, red giants are located above the main sequence, confirming statement IV as correct.

Red Giant Stars Are