Step 1: Recall the contents of a feasibility report.
A feasibility report evaluates the technical, economic, environmental, and operational viability of a mining project.
Step 2: Identify the section dealing with uncertainties.
The section that evaluates project risks, performs sensitivity studies, and discusses contingency measures is
\[
\boxed{\text{Risk Assessment and Sensitivity Analysis}.}
\]
Hence,
\[
\boxed{(B)}
\]
is the correct answer.