答案是:B.怎么理解这个句子

Richardson _B___from his studies that gender equality is still a long way off.
A．accounted B．concluded C．resulted D．confirmed
D confirmed 被证实的。
A．accounted 账户
B．concluded 下结论
C．resulted 结果，终于
因为主句是Richardson，是一个人名，所以不能表被动，应该表主动，又因为confirmed是“ 被证实的”意思。如果要用confirmed话应改为：Richardson's studies was confirmed that......
可以用concluded是因为concluded不表被动，是直接下结论的意思
显然是concluded
meaning of the sentence: Richardson 通过他的研究得到这样的结论：要实现性别的平等还很长远。本句话是同位语从句（定语从句中的一种）that一定不可省略！