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.