The bamboo buildings of the Dai people in Xishuangbanna use square pillars to suspend the house to prevent moisture and mosquito harassment. The reason why square pillars are used instead of round pillars is to prevent snakes from climbing into the bamboo buildings. Which of the following is most likely the hypothesis of the above statement? ['She people like to make things square.', 'Snakes like to climb round pillars.', 'There are many snakes in the tropical rain forest of Xishuangbanna.', 'Snakes cannot crawl around square pillars.']