B.句意看懂就明白了.
句子意思是:毫不夸张的说,美国所有地方都能通过坐汽车,火车或飞机到达,而且通常是这三种方式都可以采用.
其它选项都不通.B是个词组.more often than not:往往,多半
1.More often than not she's late for school.
他上学多半迟到.
2.Every night,more often than not,you'd find my father at the local pub.
每天晚上你大多能在附近的小酒店里找到我父亲.