A gas station charges $2.19 per gallon of gas. Use function notation to describe the relationship

between the total cost C(g) and the number of gallons purchased g.
A.) C(g)=-2.19g
B.) g=2.19C(g)
C.) C(g)=g+2.19
D.) C(g)=2.19g

D) C(g) = 2.19g