Use substitution to find the indefinite integral. 6 dm - 1)5 (6m - Describe the most appropriate substitution case and the values of u and du. Select the correct choice below and fill in the answer boxes within your choice. OA. Substitute u for the exponent on e. Let u = OB. Substitute u for the quantity under a root or raised to a power. Let u= OC. Substitute u for the quantity in the denominator. Let u = so that du = so that du = dm. so that du = dm dm.