What actions can be conducted through the Manage Apex Tests section in a User Story?

The Manage Apex Tests section in a User Story primarily focuses on the execution and review of Apex test results. This feature allows developers to run their Apex tests in order to verify the functionality of code changes and ensure that they meet specified requirements. It provides immediate feedback on the health of the codebase by showing which tests pass or fail, thereby helping to identify any issues quickly.

Executing tests is a crucial part of the development process in Salesforce, as it allows developers to ensure that new changes do not inadvertently break existing functionality. The ability to review the results also helps in understanding the performance and reliability of the code being deployed.

While deleting unnecessary tests, configuring new tests, and viewing historical execution data are important aspects of Apex test management, they are not typically part of the actions performed directly through the Manage Apex Tests section in a User Story. This section is specifically designed for executing tests and examining the results, which makes option B the correct answer.