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In the given figure, a mass M is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is k, The mass oscillates on a frictionless surface with the time period T and amplitude A. When the mass is in equilibrium position as shown in the figure, another mass m is gently fixed upon it. The new amplitude of oscillation will be:
A) A SQRT[M/(M+m)]
B) A SQRT[M/(M-m)]
C) A SQRT[(M-m)/M]
D) A SQRT[(M+m)/M]

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