On a beach 50 people are wearing sunglasses and 35 people are wearing caps. Some people are wearing both sunglasses and caps. If one of the people wearing a cap is selected at random, the probability that this person is also wearing sunglasses is \dfrac{2}{5} . If instead, someone wearing sunglasses is selected at random, what is the probability that this person is also wearing a cap?
Answer Choices
A. \dfrac{14}{85}
B. \dfrac{7}{25}
C. \dfrac{2}{5}
D. \dfrac{4}{7}
E. \dfrac{7}{10}