14B-8. Can someone show me how to do this problem?

Will rate a thumb up for good response thanks so much (PLEASE CIRCLE OR HIGHLIGHT final answer thx)

The demand for subassembly S is 100 units in week 7. Each unit of S requires 2 units of T and 2 units of U. Each unit of T requires 1 unit of V, 2 units of W, and 1 unit of X. Finally, each unit of U requires 2 units of Y and 3 units of Z. One firm manufactures all items. It takes 2 weeks to make S, 2 weeks to make T, 2 weeks to make U, 1 week to make V, 2 weeks to make W, 1 week to make X, 2 weeks to make Y, and 1 week to make Z. a) Choose the correct product structure. A. B. Level 0 Level 0 S S U (2) T (2) V(1) U(2) 1 1 2 V(1) Y(2) Z(3) W(2) X(1) 2 T(2) W(2) X(1) Y(2) Z(3) o C. OD. Level 0 Level 0 S S T(2) V(1) T(2) U (2) 1 1 2 Y(2) W(2) X(1) U(2) Z(3) 2 V(1) W(2) X(1) Y(2) Z(3) b) Choose the correct time-phased product structure. OA. B. C. D. V Z U > > Q Y T w T w T X o X X x S