1. The problem asks for the number of values of $x$ such that $f(x) = 0$ where $f(x) = ax^3 + bx^2 + cx + d$ is a cubic function. 2. A cubic function can have up to 3 real roots because it is a polynomial of degree 3. 3. The graph described resembles an "N" shape crossing the x-axis three times, indicating three distinct real roots. 4. Therefore, the number of values of $x$ for which $f(x) = 0$ is 3. Final answer: C) Three