Swimming has developed from a primal mode of movement to an advanced hobby and competitive sport. Exercising nearly every muscle group, swimming is a rigorous sport and requires intense training. In competitions swimmers typically contend for the fastest time to complete a certain distance by performing a specific swimming stroke. Also, swimmers work to build endurance and an ability to swim over long distances. Because swimming has developed into a highly intricate competitive sport, where one wrong technique can disqualify a participant, it is interesting to ponder how the sport will evolve for people in the future, either advancing into a progressive purpose or regressing to a primal mode of movement

15. The structure of this passage could be best described in what way?

A. An activity narrowed to a specific purpose and expanded to consider future implications.
B. An activity narrowed to a specific purpose and expanded to consider future deviations.
C. A hypothesis tested against certain conditions, developed into a larger thesis.
D. An activity and its purposes are explained.
E. A supposition regarding the prospect of an activity, analyzed for viability ​