She can spend exactly $100 because she can buy 8 pizzas with a 4 dollar delivery charge
Vertical stretch/compression is achieved by multiplying the function by a certain constant:
In particular, if the function is vertically stretched by a factor k, otherwise, if , the function is vertically compressed by a factor k.
So, in your case, you want to multiply the function by 1/4:
I'm sure the answer is B if it's not B it's A trust