Adding Integers

At 7.00 am the temperature was 8 degrees Celsius. What was the temperature at midnight if the temperature was 10 degrees lower

The answer is -2 because you would subtract 10 - 8 = 2 but it would be on the negative side so it would read -2 C

ELIZABETH IS RIGHT

What do I do? The answer choices are

-18*C
-2*C
2*C
18*C

What is 8-10?

Elizabeth TYSMMMMMMMMMM!!!!!!

There was no help at all

*= degrees sign