An integer x, with 10 \leq x \leq 99, is to be chosen. If all choices are equally likely, what is the probability that at least one digit of x is a 7 ?
Answer Choices
A. \dfrac{1}{9}
B. \dfrac{1}{5}
C. \dfrac{19}{90}
D. \dfrac{2}{9}
E. \dfrac{1}{3}