Answer: B) It uses humor to show that unknown factors keep damaging the probes humans send.
The main subjects in this cartoon are the alien playing baseball with his friends and the floating machine in the back with the words "mars probe" in it. Because of this, the meaning of this cartoon has to be something that alludes to both subjects, instead of just one. This rules out option A and option C. Answer D is not the right answer because the bat depicted in the picture is drawn in proportion to how close it is from the spectator's point of view relative to the mars probe which is flying up in the sky; therefore, the sizes are correct.
Answer B is correct, because it refers to both the aliens and the mars probe and because it's the cartoonist way to mock the many unknown objects that have damaged the mars probes humans have sent.