The numbers \(a, b,\) and \(c\) are chosen at random, with replacement, from the set of integers from \(1\) to \(20,\) inclusive. What is the probability that \(ab - c\) is odd?
A. \(\dfrac18\)
B. \(\dfrac14\)
C. \(\dfrac38\)
D. \(\dfrac12\)
E. \(\dfrac34\)
Answer: D
Source: Veritas Prep