Final answer:
Option B). The most useful information to include in the defect report is the severity of the defect, identification of the test object, urgency to fix, actual results, and reference to the test case specification.
Step-by-step explanation:
The most useful information to include in the defect report in this situation would be:
- Degree of impact (severity) of the defect
- Identification of the test object
- Urgency/priority to fix
- Actual results
- Reference to test case specification
These pieces of information are crucial in providing developers with a comprehensive understanding of the defect and its impact on the system. Severity helps the developers prioritize the fix, identification of the test object allows them to reproduce the issue effectively, urgency helps them allocate resources accordingly, actual results provide evidence of the problem, and reference to the test case specification assists in identifying the expected behavior.