Answer:
B. The temperature dropped 12 degrees over 3 hours. How much did it change each hour?
Explanation:
This question is basically asking for basic math terms, to solve, you need to find the correct term that fits -12 divided by 3.
Look at A., it asks how much did the temperature change, this would be incorrect because this indicates 12 - 3. Subtraction, not division, it needs to mention splitting equally.
Now B, it asks how much did the temperature change each hour, this is correct because it indicates a split evenly within the temperature change.
C is incorrect because it asks how much did it change in total, which indicates adding, not divison
Therefore B is correct.