Singles can reasonably dispose the dilemma by ______.

参考解析：

细节理解题。根据文章第四段第二句“‘Don’t bitch and moan about your particular circumstances,’ is the first advice dished out by UK-based business mentor David Carter”可知，英国商业导师大卫·卡特（David Carter）提出的第一个建议是“不要对你的特殊情况咒骂和抱怨”，因此A项排除；B项在文中并未提及，因此B项排除；根据文章第四段第三句“Single colleagues should consider clubbing together, he says, to identify and propose changes to company practices that might benefit the organisation more widely, while at the same time demonstrating their own problem-solving skills”可知，单身同事应该考虑一起聚会，一起来确定并提出改变公司的做法，这些做法可能会使更广泛的组织受益，同时也表现出他们自己解决问题的能力，因此C项错误、D项正确。故选D。