Question

read the passage.
eat carrots, see better?
carrots contain high amounts of vitamin a and are good for general eye health. however, carrots will not improve night vision. that myth goes back to british propaganda during world war ii. in 1940, the german luftwaffe, or air force, began bombing britain at night. in response, the british government ordered people to turn off their lights; the government wanted to make it difficult for german pilots to hit their targets. a new technology, radar, allowed the british air force to track and shoot down the german planes without light. to keep the technology secret, the government told the media that their pilots could see the german planes because they consumed so many carrots. consequently, people began to believe that eating carrots would help them see better in the dark.
what is the main, or central, idea of the passage?
during world war ii, the british government told the media that their pilots ate a lot of carrots.
because of a british media campaign, people thought that eating carrots would improve their night vision.

Explanation:

The passage explains that the myth of carrots improving night vision started with British WWII propaganda. The first option only states a fact from the passage, not the main idea. The second option captures how the British media campaign led people to believe carrots improved night vision, which is the central idea.

Answer:

B. Because of a British media campaign, people thought that eating carrots would improve their night vision.