The main purpose of selecting a risk response is to mitigate the residual risk to be within tolerance. Residual risk is the risk that remains after applying a risk response. Risk tolerance is the amount and type of risk that an organization is willing to accept in order to achieve its objectives. Risk response is the process of selecting and implementing actions to address risk. The goal of risk response is to reduce the residual risk to a level that is acceptable to the organization and its stakeholders. The other options are not the main purpose of selecting a risk response, although they may be secondary benefits or outcomes. References = Risk and Information Systems Control Study Manual, Chapter 4, Section 4.3.1, page 4-23.