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In case of balancing problems pertaining to locomotives, the resultant unbalanced force is minimum when

[A].	Half of the reciprocating masses are balanced by rotating masses	[B].	1/2 of the reciprocating mass are balanced by equivalent rotating mass
[C].	More than half of the reciprocating masses are balanced by rotating masses	[D].	Reciprocating masses are balanced half by equivalent opposite reciprocating masses and the balance by rotating masses
[E].	None of the above

Answer: Option A