Final answer:
Fixing a system so that it works correctly or adapting it to changes in requirements occurs during the maintenance phase of the SDLC.
Step-by-step explanation:
The correct answer is B) maintenance.
Fixing a system so that it works correctly or adapting it to changes in requirements occurs during the maintenance phase of the SDLC (Software Development Life Cycle).
In the maintenance phase, the developed system is deployed and implemented, and any issues or bugs that arise are addressed and fixed. This phase also involves making updates and improvements to the system to ensure it continues to meet the changing needs of the users.