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The function $t(x)=-3x+74$ gives the estimated temperature, in degrees Fahrenheit, of a town $x$ hours after 6 p.m., where $0\le x\le 5$. What is the best interpretation of $-3$ in this context?

A

The estimated temperature decreases 3 degrees Fahrenheit each hour.

B

The estimated temperature decreases 74 degrees Fahrenheit each hour.

C

At 6 p.m., the estimated temperature is 3 degrees Fahrenheit.

D

At 6 p.m., the estimated temperature is 5 degrees Fahrenheit.