A series of figures shows a primary shape with an internal, smaller shape. The primary shape rotates 90 degrees clockwise in each step. The internal shape alternates between a circle and a square. In step 1, the primary shape is an upward-pointing triangle with a circle inside. What will be shown in step 4?
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A
A downward-pointing triangle with a square inside.
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B
A left-pointing triangle with a square inside.
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C
A downward-pointing triangle with a circle inside.
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D
A right-pointing triangle with a circle inside.