题目解析:
找出原句的句子主干:history of twelfth century was the effort to extend their control southward. 附加信息为,为了利用好Mediterranean bonanza地中海财富。句子中不含有转折逻辑关系,因此排除A选项。B选项将in hope of的意思转变,并添加了无关原句的后半句信息;D选项的influenced by属于无中生有的信息,因此排除。而C选项既提到了欧洲北方国家try to expand their rule,也提到了to profit from the rich,是对原句主干和附加信息的分别转述,因此答案为C。