一道题求助大牛们！

In the initial planning stagrs, the condominum corporation took into account only the concerns of its prospective clients, ont those of surrounding homeowners.

A. the condominum corporation took into account only the concerns of its prospective clients

B. the condominum corporation has only taken into account  the concerns of their prospective clients

C. the condominum corporation only took their prospective clients' concerns into account 

D. the concerns of its prospective clients only were taken into account  by the condominum corporation 

E. prospective clients had their  concerns only taken into account  by the condominum corporation 

答案：e —— Why?

ps: 若是把A中的 its 改为 their ，那么A可以选么？

are you sure the answer is E?  I would choose A, cuz "the condominum corporation" is singular form, so "its" should be used instead of "their"