Everything he ______ away from him before he returned to his home town.

A．took

B．had been taken

C．had had been taken

D．had taken

涉嫌杀人的习某被公安机关抓获后，住同一小区的黄女土在向公安机关提供证言时说：由于她本人与习某有不正当性关系，因此她在某次与习某一起过夜时，听习某讲了他如何杀害被害人的事情。对于黄女士向公安机关提供的这段证言，属于：

A．案件线索，而不是证据

B．原始证据

C．书证

D．直接证据