Eat more foods high in unsaturated fats.

<h3>Active voice:</h3>
People believe that Pluto is no more a planet.
<h3>Passive voice:</h3>
It is believed by people that Pluto is no more a planet.

This sounds like a great question to answer about the reliability of Nick as a narrator. On one hand, he seems to be a very honest character. But, on the other hand, he will always have an innate bias based on his feeling towards certain characters and events.
The answer is C because it does not include a personal opinion from someone and only states statistics.
Gerund as it functions as a subject of your sentence as well.