Dell Is Trying to Solve the "Hobbits and Orcs" Problem

Dell is trying to solve the "hobbits and orcs" problem, so she must determine how to move the creatures across a river. Dell is most likely to be helped if she has had earlier experience with:

A) a similar problem also involving hobbits and orcs
B) a formally identical problem involving jealous husbands and their wives
C) other problems involving transportation across obstacles
D) problems illustrating the techniques for dealing with river currents