An ideal spring with a spring constant of 10.0 is attached to a block on a horizontal surface of negligible friction. The block is pulled back a distance A, released from rest, and allowed to oscillate. This procedure is repeated several times for different values of A. The data for two different oscillations indicated by graphs A and B are shown. The two graphs indicate oscillations with different blocks attached. Which of the following statements indicates the graph for the block with the larger mass and provides supporting evidence? The block for graph A has a larger mass because the period of oscillation is greater. B The block for graph A has a larger mass because the amplitude is smaller. C The block for graph B has a larger mass because the period of oscillation is greater. D The block for graph B has a larger mass because the amplitude is greater. E The block for graphs A and B have identical masses because the blocks have the same period of oscillation.