【正确答案】 D

【答案解析】[解析] 四个选项的词意分别为：A. superficial(表面的)；B．remarkable(令人惊奇的)；C. debatable(有争议的)；D．essential (基本的，重要的)；诙词出现的语境在第一段In fact，they say that if their companies are to compete in the global village and in the global market place，diversity is an imperative．从上文出现有if从句(如果要…)判断，D与之吻合。