【单选题】

You are the project manager in an automobile manufacturing company．Because of heavy rains，the machine parts required in your manufacturing process which a vendor was sending to you，could not reach you in time．You had anticipated this risk and planned for it in your risk response plan．So，as part of your risk response plan，you started using machine parts which had been supplied 1 year ago and were not utilized at that time．However，this has subjected your project to a new risk-that the machine parts which were not used for 1 year might be a having higher level of defects．This new risk can also be called______．

A、unidentifiable risk
B．unmanageable risk
C．secondary risk
D．residual risk