The knights in a certain kingdom come in two colors. \dfrac{2}{7} of them are red, and the rest are blue. Furthermore, \dfrac{1}{6} of the knights are magical, and the fraction of red knights who are magical is 2 times the fraction of blue knights who are magical. What fraction of red knights are magical?

**Answer Choices**

A. \dfrac{2}{9}

B. \dfrac{3}{13}

C. \dfrac{7}{27}

D. \dfrac{2}{7}

E. \dfrac{1}{3}