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

Read the following passage and answer the question.

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.

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.

Answer: B

Explanation:

The passage begins by introducing swimming, narrowing it down to competitive sports and then expanding the concept to figure out what swimming will turn into in the future. Choice “An activity narrowed to a specific purpose and expanded to consider future implications” and choice “An activity narrowed to a specific purpose and expanded to consider future deviations” are close in meaning, but choice “An activity narrowed to a specific purpose and expanded to consider future implications” refers to implications, or effects, rather than deviations, or different versions resulting from changes. This minor change separates the two choices and makes “An activity narrowed to a specific purpose and expanded to consider future deviations” superior. Choice “An activity and its purposes are explained” is relevant, but it does not include the entire scope of the passage. Choice “A supposition regarding the prospect of an activity, analyzed for viability” only focuses on the conclusion and stretches beyond what the passage actually accomplishes. Choice “An activity narrowed to a specific purpose and expanded to consider future deviations” is the best.