$\int_0^{2 a} f(x) d x-\int_a^{2 a} f(x) d x=$

• Correct answer
  A

  $\int_0^a f(x) d x$
• B

  $-\int_0^a f(x) d x$
• C

  $-\int_0^{2 a} f(x) d x$
• D

  $\int_0^{a / 2} f(x) d x$

Hence, the correct answer is option: 'A'.