Two Identical Objects,each with a Mass M,are Attached to Each

Two identical objects,each with a mass M,are attached to each other via a spring with a spring constant k.The two objects are oscillating such that one is always moving in the opposite direction and with the same speed as the other.If the spring were replaced with a stiffer spring having a spring constant equal to 2k,and the objects were replaced with objects having a mass of 2M,the period of oscillation would

A) remain the same.
B) increase.
C) decrease.

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