Final answer:
Obsessive-Compulsive Disorder (OCD) is a mental health condition characterized by compulsive behaviors, such as constant handwashing and repetitive actions like locking doors and counting steps, to alleviate anxiety caused by obsessive thoughts.
Step-by-step explanation:
The mental health condition most likely characterized by constant handwashing, repetitive locking doors, and counting steps is obsessive-compulsive disorder (OCD). OCD is an anxiety disorder that manifests in obsessive thoughts and compulsive behaviors. In this case, the constant handwashing, repetitive locking doors, and counting steps are common compulsions seen in individuals with OCD. These actions are performed to alleviate distress and anxiety caused by obsessions or intrusive thoughts.
Learn more about Mental health conditions