C. a memory aid
A mnemonic is a memory aid, usually a phrase or visual, that helps you remember a fact.
To make awareness that pollution is getting worse and needs to stop.
Answer:
(b) to explain how light travels.
Explanation: Hope this helped
The clause <em>who bought the coat </em>is used as an adjective subordinate clause because it modifies the noun <em>the man.
</em>What man forgot his umbrella? (The one) who bought the coat.<em>
</em>
