The pulley arrangements shown in figure are identical, the mass of ...

The pulley arrangements shown in figure are identical, the mass of the rope being negligible. In case 1 , the mass \( m \) is lifted by attaching a mass \( 2 \mathrm{~m} \) to the other end of the rope. In case II, the mass \( m \) is lifted by pulling the other end of the rope with a constant downward force \( F=2 \mathrm{mg} \), where \( \mathrm{g} \) is acceleration due to gravity. The acceleration of mass in case \( \mathrm{I} \) is:
(A) zero
(B) more than that in case II
(I)
(II)
(C) less than that in case II
(D) equal to that in case II