Hello please help me solve this question

The demand for subassembly S is 100 units in week 7. Each unit of S requires 2 units of T and 1 unit of U. Each unit of T requires 2 units of V, 2 units of W, and 2 units of X. Finally, each unit of U requires 2 units of Y and 2 units of Z. One firm manufactures all items. It takes 2 weeks to make S, 1 week to make T, 2 weeks to make U, 1 week to make V, 3 weeks to make W, 2 weeks to make X, 2 weeks to make Y, and 1 week to make Z. a) Choose the correct product structure. OA OB. Level 0 Level 0 S s - V(2) VO) (2) V(2) 1 1 2 T2) W2) X12) Y(2) Z2) 2 Y2) W(2) X(2) U(1) Z(2) OD O c. o Level 0 Level 0 s S T(2) U (1) U (1) (2) 1 1 2 V2) Y(2) Z2) W2) X(2) 2 V (2) W12) X(2) Y (2) Z(2)