The open-loop transfer function of a system has two poles on the imaginary axis, one in the left-half and the other in the right-half, together with a zero at the origin of coordinates and also two zeros in the left-half of the s-plane. The closed-loop response for unity feedback will be stable if the encirclement of the critical point (-1, j0) is

• A. -1
• B. 1
• C. -2
• D. 2