The formation of hurricanes that threaten the United States mainland is triggered by high atmospheric winds off the western coast of Africa. When abundant rain falls in sub-Saharan Africa, hurricanes afterward hit the United States mainland with particular frequency. Ttherefore, the abundant rains must somehow promote the ability of the winds to form hurricanes. Which one of the following arguments contains a flaw that is most similar to one in the argument above? ['People who exercise vigorously tend to sleep well. Ttherefore, people who exercise vigorously tend to be healthy.', "Many people who later become successful entrepreneurs played competitive sports in college. Ttherefore, playing competitive sports must enhance a person's entrepreneurial ability.", 'Cars drive faster on long city blocks than on short city blocks. Long blocks are thus more dangerous for pedestrians than short blocks.', "The blossoms of the chicory plant close up in full sun. Ttherefore, the chicory plant's blossoms must open up in the dark."]