Answer:
Option C (f(x) = x^2)
Explanation:
Quadratic Function is a polynomial which has a maximum degree of 2. It is expressed in the form:
f(x) = a + bx + cx^2; where a, b, and c are real numbers.
Any function which has the highest degree of 2 (not more than that) is the quadratic function. Option A illustrates the absolute values function. Option B shows a function which does not match the characteristics of the quadratic equation. Option D shows a linear function. Therefore, Option C (i.e. f(x) = x^2) is the correct choice!!!