A pulley fixed to the ceiling carries a string with blocks of mass \( m \) and \( 3 \mathrm{~m} ...

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A pulley fixed to the ceiling carries a string with blocks of mass \( m \) and \( 3 \mathrm{~m} \) attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration [UPSEAT 2002]
(a) 0
(b) \( g / 4 \)
(c) \( \mathrm{g} / 2 \)
(d) \( -g / 2 \)
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