What does Fitt's Law predict about movement time in motor tasks?

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Fitt's Law links how long a movement takes to how hard it is to hit a target. The formula MT = a + b log2(2D/W) shows a baseline time plus a term that grows with difficulty. D is the distance to the target and W is the target width. If the distance increases or the target gets smaller, the index of difficulty log2(2D/W) goes up, so movement time rises. If the target is larger, the same distance is easier, the index drops, and movement time falls. The constants a and b adjust for baseline speed and how sensitive you are to difficulty.

So the statement that movement time increases with distance and decreases with target size is exactly what the formula predicts. The other options misstate the relationship by claiming independence from distance and size, or that movement time decreases as distance increases, or that it depends only on speed.