A vertical spring with force constant k is fixed on a table. A ball of mass m at a height h above the free upper end of the spring falls vertically on the spring so that the spring is compressed by a distance d. The net work done in the process is

1. A. mg(h + d) - 1 2 kd 2
2. B. mg(h - d) - 1 2 kd 2
3. C. mg(h - d) + 1 2 kd 2
4. D. mg(h + d) + 1 2 kd 2

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