Which of the following situations would fulfill the author’s prophecy for swimming?

This question refers you to the conclusion sentence. The author states clearly that swimming must either progress into a new form or regress to the primal mode of movement. "Swimming remains a competitive Olympic sport." and "People swim in home and community pools to relax and exercise." can be eliminated because they show no change, just a continuation of current circumstances. "Humans settling on the moon use swimming techniques to move through space." is an actual possibility as humans may very well be settling in outer space in the future. It is the most realistic and relevant prophecy according to the premises developed by the author."Animals, including amphibians, begin to swim instinctively upon birth, as a dominant genetic trait." refers to animals anyway, when the author specifically was predicting a future for humans.