Why are the fine particles that make up air pollution more dangerous to humans?

Question

Options:

A . They get stuck in our nose hairs and make us sneeze.

B . They are small enough to get all the way into our lungs and get stuck there.

C . They are so small that there are no problems breathing them in.

D . They are made up of pollen and other things that people are allergic to.

Answer: Option B

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