Teacher: Have you ever heard of the Law                      of (       ⓐ        )?

Mi-na: No. I haven't. What is that?

Teacher: ⓑThe law answers many questions about prices.

Mi-na: Please tell me ( ⓒ ) about the law.

Teacher: Well, ⓓlet me put it this way. Changes in the prices of goods cause changes in supply and demand. Does that make sense?

Mi-na: Yes. Thank you.