137. A study of marital relationships in which one partner's sleeping and waking cycles differ from those of th e other partner reveals that such couples share fewer activities with each other and have more violent arguments than do couples in a relationship in which both partners follow the same sleeping and waking patterns. Thus, mismatched sleeping and waking cycles can seriously jeopardize a marriage.

(A) Married couples in which both spouses follow the same sleeping and waking patterns also occasionally have arguments than can jeopardize the couple's marriage

OG解释: The argument does not depend on there being only one cause of marital problems, so choice A is incorrect.

忽然想不通了, 请大家帮我解释一下, 谢谢!