单选题 According to the author, the accidents are mainly caused by ______.

【正确答案】 B
【答案解析】[试题类型] 细节题
[解题思路] 根据文章的第一段“But more often than not there is a chain of events leading up to the misfortune --frustration,tiredness,or just bad temper--that shows what the accident really is,a sort of attack on oneself.(但是往往有连锁事件导致了这种不幸——挫折、疲惫或仅仅心情不好——这说明事故说到底是一种自我攻击。)”,可知选项B正确。