A uniform meter stick is supported on a fulcrum at the 25-cm mark. A 0.50-kg object is hung from the 0-cm end of the meter stick, and the stick is balanced horizontally. The mass of the meter stick is:
(a) 0.25 kg; (b) 0.50 kg;
(c) 0.75 kg; (d) 0.75 kg;