The first option is the answer, it is going from P to Q so the only logical answer would be the first choice
Answer:
10.5
Step-by-step explanation:
A unit rate simply means how many of one type of units you get per 1 other type of unit.
Examples of that:

This is rate of fluid flow of some pump for example. It pumps 300 liters every second.
Other example:

This is example for speed. Somebody is moving at 50 kilometers per hour (every hour he travels 50 kilometers)