B is
two fifths of the land in that country 那个国家的五分之二的土地为什麼是is 不是are？若分数所在of短语做主语，谓语依照of后的名词而定：two fifths of the students are on time.(指名词复数时，谓语用复数。）two fifths of the land is polluted.(指不可数时，谓语用单数。）那个是主语啊？ land or country？two fifths of the land in that country那个国家的五分之二的土地land是不可数名词，被分数修饰的不可数名词做主语时，谓语动词仍然用单数