This is slightly tricky. It is important to realise which number indicates what.
1 on the graph indicates the change in internal environment.
2 indicates the point at which the response to the change is initiated.
3 indicates the time taken to bring the level back to normal.
Since someone has a condition which makes their homeostatic system less responsive, it would take longer for their system to start the response.
Hence, D is correct. 2 would be higher as the person’s homeostatic response would take longer to respond.