. As is often said, knowledge is power, and power in the wrong hands can be dangerous. ... If you yourself are faced with an opportunity to gain knowledge and later apply it, you must decide whether the potential benefits are worth any harm that may be done as a result.
This is a compound sentence because you can break it into two sentences.
Hope this helps

<h2>The 3 sentences are:-</h2>
- In the evenings, She sits on the front porch to admire her immaculate lawn.
- Flipped on its back, the beetle that Clara soaked with insecticide dies under the refrigerator.
- He's been singing all day.

1- C. To show how Jeremy finds the real world awkward and embarrassing.
2- B. Occurs repeatedly over time.
3- C. On November 22, 1963, President Kennedy was assassinated, and American history was forever altered.
He probably uses a metaphor because a simile uses the words like and as and a metaphor does not use the words like and as. Hope this helps!