The graph shows the tip amount that 14 different customers left, based on the their bill. A trend line has been drawn for the data. The equation for the line is: y = 0.14x + 2.5. Which BEST interprets the slope of the linear model? .

A) A $1 increase in the bill is associated with a $2.50 increase in tip amount.
B) A $2.50 increase in the bill is associated with a $1 increase in tip amount.
C) A $0.14 increase in the bill is associated with a $1 increase in tip amount.
D) A $1 increase in the bill is associated with a $0.14 increase in tip amount.