A sequence shows a black dot moving within a 3x3 grid. The first frame shows the dot in the top-left corner. The second frame shows it in the top-center. The third frame shows it in the middle-center. The fourth frame shows it in the middle-right. Which frame correctly shows the fifth position in the sequence?
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A
A grid with the dot in the bottom-right cell.
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B
A grid with the dot in the bottom-center cell.
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C
A grid with the dot in the top-right cell.
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D
A grid with the dot in the middle-left cell.