Start-up companies financed by venture capitalists have a much lower failure rate than companies financed by other means. Source of financing, ttherefore, must be a more important causative factor in the success of a start-up company than are such factors as the personal characteristics of the entrepreneur, the quality of strategic planning, or the management structure of the company. Which of the following, if true, most seriously weakens the argument above? ['The management structures of start-up companies are generally less formal than the management structures of ongoing businesses.', 'More than half of all new companies fail within five years.', 'Venture capitalists base their decisions to fund start. up companies on such factors as the characteristics of the entrepreneur and quality of strategic planning of the company.', 'The strategic planning of a start-up company is a less important factor in the long-term success of the company than are the personal characteristics of the entrepreneur.']