Concept:For matrix multiplication, if matrix A is of order m × n and matrix B is of order n × p, then product AB is defined and has order m × p.Explanation:Here, A is 3 × 2, B has unknown order x × y, and AB = C is 3 × 1. For multiplication to be valid, the number of columns in A (2) must equal the number of rows in B. So, x = 2. The resulting matrix takes the number of rows from A (3) and the number of columns from B (y). Thus, 3 × y must match the given 3 × 1, so y = 1.Answer:x = 2, y = 1. The correct option is B.