【答案解析】解析：事实细节的找寻和判断。根据原文Clark Warren has been a marriage counselor for 35 years可知，此人是婚姻顾问。由此可见，B项与原文相符，因此该项为正确答案。
单选题
How many years has his own marriage lasted?
【正确答案】
A
【答案解析】解析：数字信息的找寻和判断。根据原文His own marriage，happily，has lasted 43 years可知他婚姻幸福，结婚已有43个年头。由此可见，A项与原文相符，因此该项为正确答案。
单选题
Which of the following is true according to the passage?
【正确答案】
C
【答案解析】解析：推理判断题。根据原文His own marriage，happily，has lasted 43 years—and he and his wife，Marylyn，have raised three daughters who also enjoy happiness of marriage可知，他不仅自己婚姻幸福，而且他的三个女儿也是如此。由此可推断他们全家都是婚姻幸福美满。因此C项与原文相符，该项为正确答案。
单选题
Which of the following is the most important factor in a successful marriage?
【正确答案】
D
【答案解析】解析：事实细节的找寻和判断。根据原文The key，he says…It is…are you ready? That is choosing wisely in the first place说婚姻幸福的关键是你是否作好了准备，即首先要进行明智的选择。由此可见D项与原文相符，因此该项为正确答案。