Mashaal Masha
According to data provided by the US Department of Energy, the average price per gallon of regular gasoline in the United States from September 1, 2014, to December 1, 2014, is modeled by the function $F$ defined below, where $F(x)$ is the average price per gallon $x$ months after September 1.

$F(x)=2.74-0.19(x-3)$

The constant $2.74$ in this function estimates which of the following?
Difficulty: Hard
A: 

The average monthly decrease in the price per gallon

B: 

The difference in the average price per gallon from September 1, 2014, to December 1, 2014

C: 

The average price per gallon on September 1, 2014

D: 

The average price per gallon on December 1, 2014

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