Computers perform actions that are closer to thinking than anything nonhuman animals do. But computers do not have volitional powers, although some nonhuman animals do. Which one of the following is most strongly supported by the information above? ['Having volitional powers need not involve thinking.', 'It is necessary to have volitional powers in order to think.', 'Things that are not animals do not have volitional powers.', 'Computers will never be able to think as human beings do.']