HW S Homework: Chapter 2 Homework < Question 5, 2.1.29 > O P For the following system of equations in echelon form, tell how many solutions there are in nonnegative integers. x+3y+z=76 7y + 2z=28 ... Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. There are nonnegative solutions. B. There are infinitely many solutions. C. There is no solution.