Sensitive analysis

The examiners explains this in the last sentence to this part of his answer :-)

Thank you sir, but I do not understand If sensitivity is not a way to consider risk (as the requirement of the question); it should not be discussed at first. In stead of discussion on sensitivity at first; and at last, it said that however it is not to use to consider risk Do you think so ?

No. As the examiner writes in his answer, although strictly speaking sensitivity is more concerned with measuring the effect of uncertainty, risk and uncertainty are inter-connected. The smaller the sensitivity the more risk there is of the uncertainty affecting the decision. I do say this in my free lectures.

I wonder that if there is a multi choice question said that sensitivity analysis is technique for analyzing the risk. It is true or false ?

False - nobody is saying that it analyses risk.