Ayogurt with 1 topping is sold for $3.75. additional toppings can be added for $0.65 cents each. if y represents the total cost and x represents the total number of toppings added, which function rule describes this pattern?

a) y=3.75(x-1)+0.65
b) y=3.75-0.65(x+1)
c) y=3.75+0.65x
d) y=3.75+0.65(x-1)

and how did you get that answer