Answer:
C
Explanation:
Think about the prefixes to solve this. I've attached a Latin prefix chart. It might help to memorize this!
Tri- carbon means 3 carbons.
Nona- chloride means 9 chlorines.
So the answer is C₃Cl₉.
The reason we use these prefixes is because it's a covalent compound. If it's ionic, we don't need to use the tri- or nona- parts of it.
