Z is the answer, that's the hose in which the Carbon Dioxide is released.
Answer:
Step-by-step explanation:

(3m^2-p)(3m-p^2)
You factor out the 3m^2 and p from the combined like terms and then group those into a factor and group the two identical factors together and (3m^2-p)(3m-p^2) is your answer.
There isn’t a picture so we can see