问题：
[单选题] Text4"My expectations and my happiness all got destroyed,that was the minute that it happened."So testified Sony Sulekha,one of the plaintiffs in the largest human-trafficking case ever brought in Ame
A、the absence of evidence oflabours.
B、the failure to assess the number oflabours.
C、the difficulty to prove the existence of bonded labours.
D、the prevalence of bonded labours.
参考答案：
A、the absence of evidence oflabours.
● 参考解析
