Humans' emotional tendencies are essentially unchanged from those of the earliest members of our species. Accordingly, although technology makes possible a wider range of individual and societal choices than in centuries past, humans are generally unable to choose more wisely. The argument depends on assuming which one of the following? ['Regardless of the range of choices available to humans, they choose on the basis of their emotions alone.', 'Humans have undergone no significant changes since the origin of the species.', "Humans would now be able to make wiser choices than in centuries past only if an essential change had taken place in humans' emotional dispositions.", 'Humans who make wise choices are generally in control of their emotions.']