A certain barrel is$$\frac{1}{5} $$full. When k liters of liquid are added to the barrel, it becomes$$\frac{ 2}{3}$$ full. In terms of k, what is the capacity of the barrel, in liters?
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A$$\frac{3}{8}k$$
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B$$\frac{7}{15}k$$
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C$$\frac{15}{7}k$$
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D$$\frac{7}{3}k$$
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E$$\frac{8}{3}k$$
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正确答案: C