Answer to this question, asap please :)

Question 5 (1 point) By choosing u; as the right endpoint of each subinterval [1,3], [3,5], [5,7], [7,9], the approximate (x - 6 ) dx using Riemann sum is O a) 372 O b) 20 O c) 112 O d) 40 O e) None of the above