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Math·Algebra·Linear functions

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$T(x)=67-8x$ The function $T$ estimates the temperature, in degrees Fahrenheit (${}^{\circ }\text{F}$), in a certain city one day in January, where $x$ is the number of hours after 10 a.m. and $1\le x\le 5$.

According to the function, what was the estimated decrease in temperature each hour, in ${}^{\circ }\text{F}$, in this city during this time period?

A

4

B

8

C

59

D

67