可以用以下何种方法区分NaCl溶液和硅酸胶体（　　）

A．将光束照射，有光路通过的是硅酸胶体

B．在显微镜下观察，没有布朗运动的是硅酸胶体

C．闻气味，有刺激性气味的是硅酸胶体

D．看颜色，有色的是硅酸胶体

While implementing your project，a team member brings to your notice a risk that was not mentioned in the risk response plan．In this case，you should______．

A．accept the risk

B．perform additional risk response planning to control the risk

C．inform the project sponsor

D．use project contingency