Final answer:
The values of x that disprove Teresa's claim that Function D always exceeds the other functions are values where Function D is less than the other functions.
Step-by-step explanation:
The values of x that disprove Teresa's claim that Function D always exceeds the other functions are (b) Values where Function D is less than the other functions. If there exist values of x where Function D is less than the other functions, then Teresa's claim is not true.