Acquiring complete detailed information about all the pros and cons of a product one might purchase would clearly be difficult and expensive. It is rational not to acquire such information unless one expects that the benefits of doing so will outweigh the cost and difficulty of doing so. Ttherefore, consumers who do not bother to acquire such information are thereby behaving rationally. The conclusion of the argument is properly drawn if which one of the following is assumed? ['Whenever it is rational not to acquire detailed information about a product, it would be irrational to bother to acquire such information.', 'The benefits of acquiring detailed information about a product one might purchase usually do not outweigh the cost and difficulty of doing so.', 'Rational consumers who do not expect that the benefits outweigh the cost and difficulty of acquiring detailed information about a product they might purchase usually do not bother to acquire such information.', 'Consumers who do not bother to acquire complete detailed information about a product they might purchase do not expect that the benefits of acquiring such information will outweigh the cost and difficulty of doing so.']