During a volcanic eruption the particles of dust precipitate at the rate of $${2}\cdot\frac{1}{4}$$ inches every three hours. If a volcano erupted for the first time for 2 hours and erupted again on the next day from 11:00 to 20:00, what was the total fall-out of particles in inches?
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A$${6}\cdot\frac{3}{4}$$
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B$${8}\cdot\frac{1}{4}$$
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C$${11}\cdot\frac{1}{4}$$
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D$${21}\cdot\frac{3}{4}$$
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E$${24}\cdot\frac{3}{4}$$
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正确答案: B