A student is observing an object of unknown mass that is oscillating horizontally at the end of an ideal spring. The student measures the object's period of oscillation with a stopwatch. While the object is continuously oscillating, the student determines the maximum speed of the object during two oscillations. The first speed is 3.5 m/s and the second speed is 2.7 m/s. Which of the following could account for the decrease in the object's maximum kinetic energy? A. Energy was transferred from the spring to the object, which decreased the maximum potential energy of the spring. B. As energy was transferred back and forth between the object and the spring, a greater average share of the energy became potential energy of the spring.

C. The object-spring system lost energy to its surroundings.

D. Energy was transferred from the object to the spring, which increased the maximum potential energy of the spring.