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Math·Algebra·Linear functions

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The function $T(x)=66-8x$ estimates the temperature, in degrees Fahrenheit (${}^{\circ }$F), in a certain city one day in January, where $x$ is the number of hours after 10 a.m. and $1\le x\le 7$. Which statement is the best interpretation of $T(6)=18$ in this context?

A

6 hours after 10 a.m., the function estimates that the temperature is $18^{\circ }$F.

B

6 hours before 10 a.m., the function estimates that the temperature decreased $18^{\circ }$F.

C

6 hours after 10 a.m., the function estimates that the temperature decreased $18^{\circ }$F.

D

6 hours before 10 a.m., the function estimates that the temperature is $18^{\circ }$F.