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?
because of a british media campaign, people thought that eating carrots would improve their night vision.
during world war ii, the british government told the media that their pilots ate a lot of carrots.

Explanation:

The passage first states that carrots are good for general eye health but won't improve night vision. Then it tells the story of how during World War II, the British government used the "carrots improve night vision" idea as propaganda to cover up the use of radar. This led people to believe that eating carrots helps with night vision. The first option encompasses the main elements of the propaganda and the resulting belief, while the second option only mentions part of the propaganda (the government telling the media about pilots eating carrots) without the full context of why (to cover radar) and the outcome (people believing carrots improve night vision).

Answer:

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