Ms. Carr asks her students to read any 5 of the 10 books on a reading list. Harold randomly selects 5 books from this list, and Betty does the same. What is the probability that there are exactly 2 books that they both select?
Answer Choices
A. \dfrac{1}{8}
B. \dfrac{5}{36}
C. \dfrac{14}{45}
D. \dfrac{25}{63}
E. \dfrac{1}{2}