A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probabilitythatthe2 rosebushes in the middle of the row will be the red rosebushes?
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A\frac{1}{12}
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B\frac{1}{6}
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C\frac{1}{5}
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D\frac{1}{3}
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E\frac{1}{2}
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正确答案: B