Towns once bought their water from carriers who filled skins at the river. Piped supply ended that trade, but it did more: clean water at a tap cut disease sharply, and the hours saved from carrying went into school and paid work. Which is the best one-sentence summary? A Water carriers lost their trade. B Piped water improved health and freed time as well as replacing the carriers. C Governments ought to build more pipelines. D Water was once carried in skins.
- The central idea follows but it did more: piped water brought wider gains.
- The two gains are less disease and time for school and work.
- A and D each give one early detail. C is an opinion that the passage never states.
- B holds the main point and both gains in the order of the passage.
Answer: B.