answer part C in chat, I cannot open files!!!!

The following function is positive and negative on the given interval. f(x) = sin 3x; 2 a. Sketch the function on the given interval. b. Approximate the net area bounded by the graph of f and the x-axis on the interval using a left, right, and midpoint Riemann sum with n = 4. 3T C. Use the sketch in part (a) to show which intervals of 2 -,2x make positive and negative contributions to the net area. . . . use a CalculaLUL W appixilliale wie alta. Ille Hel area, appIVAIllialeu usIly wie IIIupUnit NeilIan III SUITI WIUI II - 4, IS 0.530 (Do not round until the final answer. Then round to three decimal places as needed.) c. Which intervals of 7,21 make positive and negalive contributions to the net area? O A. Positive on [0,It]; negative on [n,2x] O B. Positive on 3 12nt ; negative on 2 ' 3 O C. Positive on 2 ' 3 ; negative on 3 12n