Reminder: the chicken’s goal is to cross the road. A correct answer could be b). Spending time on the road moving from one side to the other is part of crossing the road and is known to be a way to cross things in general. Waiting until vehicles are not coming strengthens the chance of success by protecting the chicken and its behavior during a step in crossing. a) also strengthens success by ensuring the chicken is fed, but is a habitual chicken behavior that a chicken may want to do anyway, and does not make progress on meeting the goal by increasing nearness to it or reliably producing tools steps or situations to do this other. A better phrasing of a) could be “if the chicken is too hungry to cross, spend limited time scrounging for worms only if this increases chances of crossing.” c) does not increase any described metrics that could meet the goal d) makes the goal more distant and is the worst option summary: a) pursues the goal by directly and correctly engaging the most well-known approach to solution