A Survey of 12 People at a Bookstore Showed That $12 / 86$

Multiple Choice

A survey of 12 people at a bookstore showed that five had purchased a hardcover book. If seven people are selected at random, what is the probability that four of them had purchased a hardcover book?

A) $12 / 86$
B) $43 / 86$
C) $19 / 86$
D) $7 / 86$