Let f be a continuous function for all real numbers. Let g be the function defined by g(x) = √‚ªƒ (t) dt. If the average rate of change of g on the interval 2 ≤ x ≤ 5 is 6, which of the following statements must be true? (A) The average value off on the interval 2 ≤ x ≤ 5 is 6. (B) g'(2) = 6 (C) g'(5) + g'(2) 2 (D) √ 8(x) dx = 6 = 6