50 points: Which of the following described does not have an inverse:

(A). A(t) = The altitude of an airplane as a function of time (t) between take-off and landing.
(B). None of these - They all have inverses.
(C). K(t) = The temperature in Kelvin as a function of the temperature (t) in Fahrenheit.
(D). V(m) = The volume of (m) kilograms of sand.
(E). A(d) = Your age as a function of the date (d).