The length of life is either due to genetic factors or due to acquired conditions. Xu has a genetic factor in longevity, so his long life has nothing to do with acquired conditions. Which of the following is the same as the argument structure:. ['Wu Song passed Jingyanggang, either killed the tiger or was eaten by the tiger. Wu Song killed the tiger, so he was not eaten by the tiger.', 'There are only two roads from this small mountain village to the county seat, one big road and one small road; the road is far away, Xiao Liang decides not to take the big road, so he only has to take the small road.', 'Reasons for poor homework or inattentive listening in class, or inadvertent review after class. Xiao Ming listened to class carefully, so he did not review it carefully after class.', 'The college requires that freshman students take at least one foreign language course, either English or French. Xiaohua takes English courses, so he cannot take French courses.']