Let $\int_0^1 f(x) \, dx = 1$,$\int_0^1 x f(x) \, dx = a$,and $\int_0^1 x^2 f(x) \, dx = a^2$. Then the value of $\int_0^1 (x - a)^2 f(x) \, dx$ is:

  • A
    $0$
  • B
    $a^2$
  • C
    $a^2 - 1$
  • D
    $a^2 - 2a + 2$

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