Use substitution to find the indefinite integral. 6 dm (6m - 1)" 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. O A. Substitute u for the quantity under a root or raised to a power. Let u = so that du = (dm. O B. Substitute u for the exponent on e. Let u = so that du = dm. O C. Substitute u for the quantity in the denominator. Let u = , so that du = ( )dm. 6 dm (6m - 1)"