From the context, the underlined word “disconcerting”(Para. 3, line2) most probably means ______.

参考解析：

词义猜测题。根据第三段“To some, the thought of having to write an assigned number of pages, often more than ever produced before, is disconcerting. To others, the very idea of having to work independently is threatening. But there is no need to approach paper assignment with anxiety…”对上下文进行分析，对一些人来说，要写指定页数的文章，而且常常比以往任何时候都要多，这让他们感到不安。对其他人来说，必须独立完成论文的想法本身就是一种威胁。但是没有必要焦虑地对待论文作业。从第三句中的“but”可推断出“disconcerting”与第二句中的“threatening”一样，均能给人带来“anxiety”，而在给出的四个选项中，misleading意为“误导”；embarrassing意为“令人尴尬的”；stimulating意为“促进”；upsetting意为“令人心烦意乱的”。故选D。