Which of the following statements is not true?

A. As the slope of an inclined plane increases, the velocity ratio decreases.
B. The efficiency of an inclined plane decreases as the slope increases.
C. The effort required to push a given load up an inclined plane increases as the slope increases
D. The mechanical advantage of smooth inclined plane depends on the ratio of the length to the height of the plane.  

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Correct Answer: D