Question

read the passage.
to stand or not to stand?
in 2016, vallecito elementary school in san rafael, california, became the first u.s. school to replace all of its ordinary desks with raised desks that students stand at. speaking to a reporter from time for kids magazine, one student at the school gave the standing desks high praise. \you feel happier, youre less tired, and youre more active,\ she said. according to several studies, children working at standing desks burn more calories and are more focused on tasks. however, some teachers and parents are opposed to the change. they are concerned that standing for long periods of time could cause fatigue, strain on the legs and feet, or posture problems. in addition, standing desks are more expensive than seated desks. only time will tell whether standing desks will prove to be the next big trend or a failed experiment.
what is the main, or central, idea of the passage?
studies have shown that standing desks help students focus on their schoolwork while being more active.
some people say that standing desks promote good study habits, but others are wary about the new desks.

Explanation:

The passage first introduces a school using standing desks and positive student feedback with study support. Then it presents concerns from teachers/parents about fatigue, cost, etc. The first option only covers the positive study - related aspect, while the second option includes both the positive view (promote good study habits from the student praise and studies) and the negative/wary view (teachers' and parents' concerns), which matches the passage's content that has both support and opposition for standing desks.

Answer:

Some people say that standing desks promote good study habits, but others are wary about the new desks.