Which of the following are the opposite angles of the given quadrilateral?

• A. ∠A, ∠B; ∠A, ∠D; ∠B, ∠C; ∠C, ∠D
• B. ∠A, ∠C; ∠B, ∠D
• C. ∠A, ∠B
• D. ∠A, ∠D; ∠B, ∠C