很高兴为你解答.
此题正解为B.
解析：as well as 遵循主谓一致的就前原则,谓语动词随着第一个名词变化,the father 才是真正的主语（中心词语）,再根据every Saturday morning 采用一般现在时的谓语动词第三人称单数,选B.The father as well as his there childern 是整个句子的主语,goes skating 是谓语,on the frozen mountain 地点状语,every saturday morning 是时间状语.
句子大意：那个父亲和他的孩子们每个周六早上都去那座冰山滑雪.