Answer: Problem analysis phase
Step-by-step explanation: Problem phase analysis is the mechanism that helps in studying the problems and issue that occur in the application and system of any business organization.It helps in identification of the reason and consequences of the detected problems.The requirements of user and resources to accomplish business system is also analyzed.
Other options are incorrect because scope definition phase is used for identification of the boundaries of any project regarding opportunities and issue in business .
Requirement analysis phase is used for gathering the need of the user and the condition requirement to fulfill a project. Decision phase analysis is done to bring out the best possible solution for any project. Thus, the correct option is problem analysis phase.