Which of the following best expresses the esse...

Câu hỏi: Which of the following best expresses the essential information in the highlighted sentence in the passage?

A Because of their nearness, habitable planets orbiting smaller stars usually have either constant daylight or constant night.

B The habitable zones of small stars are so close to the star that planets within them do not spin.

C One problem with some stars is that their habitable zones are tidally locked into either light or darkness.

D Some stars become tidally locked, so that they only shine light on one side of a planet.