Question

choosing an argument topic
idea: meteorites
which narrows down this idea
into a topic for an argument?
black holes form and create wormholes in space
how far saturn is from the sun is a big deal
meteorites are an important part of our solar system

Explanation:

The original idea is "Meteorites". The first option is about black holes and wormholes (unrelated to meteorites). The second option is about Saturn's distance from the Sun (unrelated to meteorites). The third option directly focuses on meteorites and their role in the solar system, which narrows down the idea of meteorites into a specific topic for an argument.

Answer:

Meteorites are an important part of our solar system