A student studying naps and quiet rest before problem solving took these notes from two sources: Notes: - Study A found that a short nap improved performance on a task requiring unusual word associations. - Study B found that quiet wakeful rest improved accuracy on a rule-based logic task. - Neither study tested the other task with the same condition. The student wants to compare the task-specific benefits while avoiding a broad ranking of the conditions. Which choice best states the comparison the notes support?