Question

review the details below.

• would-be marathon runners must be physically prepared to follow a rigorous training schedule.
• runners attempting their first marathon should have at least one year of running experience.
• training at the race site can help new runners know what to expect from a marathon-length course.

choose the best topic sentence to introduce a paragraph containing these details.
even experienced marathon runners must prepare for the physical and mental demands of running a 26.2 mile course.
first-time marathon runners must take steps to prepare themselves for the race.
new runners are at a distinct disadvantage if they have never run a marathon race course before.

Explanation:

The details focus on preparation for would-be/first-time marathon runners (rigorous training, 1 year of experience, training at the race site). The chosen topic sentence directly introduces the need for first-time runners to prepare, which aligns with all supporting points. The other options either focus on experienced runners or only one aspect (disadvantage of unfamiliar courses), making them less comprehensive.

Answer:

First-time marathon runners must take steps to prepare themselves for the race.