PT 62 S4 Q18

If there are sentient beings on planets outside our solarsystem, we will ... ...

The argument's conclusion can be properly inferred if which one of the following is assumed?
(A) There are no sentient beings on planets in our solar system other than those on Earth.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-B, Dec. '10 LSAT (PT 62 Sec. 4)