Answer:
I think its C. It increased by 11 and 3/4 °C.
Explanation:
I say that because it increases by 10 (-5 from +5) then to 6 which makes it 11 times. Then, it increases by 3/4 since its 2/4 + 1/4 which gives u 3/4. Also, its an increase and not a decrease because the numbers on the number line is going pass 0, so that shows an increase.