Evaluate the continuity of the piecewise function f(x) = {3x + 1 for x < 0, x^2 for x ≥ 0} at x = 0.

• A. The function is continuous at x = 0 because the limits from both sides are equal.
• B. The function is discontinuous at x = 0 because the function value is not defined.
• C. The function is continuous at x = 0 because the function value is defined.
• D. The function is discontinuous at x = 0 because the limits from both sides are not equal.