In para 14, the last sentence, "a young designer in the Swinging London fo the 1960s", refers to_____.

A. Orbital space around the star.
B. NASA discovered new habitable planets.
C. How Kepler spacecraft detects planets orbiting distance stars.
D. Why Earth and Mars are considered to be in the habitable zone .

A. Orbital space that is close to the star.
B. Orbital space that keeps the planet's surface neither too hot nor too cold.
C. Orbital space that is far from the star.
D. Orbital space that is around the sun.

A. 对
B. 错