A Zoo Park charges $10 per car plus $1 per person as an admission fee. The total charge for a car with x people is f(x) = x+10. How will the graph of this function change if the per car charge is changed to $5 per car?

A)The line will shift vertically down by $5.
B)The line will shift vertically up by $5.
C)The line will shift vertically up by $15.
D)The line will shift vertically down by $15.