请教一题gwd

serveral financial officers of the company spoke on condition that they not be named in the press reports.

a) that they not be named

b) that their names will not be used

c) that their names are not used

d) of not having their names

e) of not naming them

答案c.  为什么b不对？请指教

选A吧?on condition that一般用虚拟语气，或一般现在时与一般过去时

而且they not be named这个用法很简洁。