has the lowest temperature. has the smallest mass. rotates the slowest. is farthest from the Sun.
I gave my students this multiple choice question: The surface gravity of Pluto is the weakest of the nine planets because Pluto

Only one answer is correct among these 4 choices:
- has the lowest temperature.
- has the smallest mass.
- rotates the slowest.
- is farthest from the Sun.

Could you tell me which one is correct?

has the smallest mass.