Can someone check my work I believe b and c are wrong

Use a change of variables to evaluate the following indefinite integral. ( VX + 8) 6 dx 21x Determine a change of variables from x to u. Choose the correct answer below. O A. U= 21X OB. U= 1X OC. u= (1X +8)6 OD. U= 1X +8 Write the integral in terms of u. 9 (8 + x / ) J dx = 21x du Evaluate the integral. ( Vx + 8) 6 dx = X + 8 + C 21x