Step 1: Understand the definition
- "Acrophobia'' is derived from the Greek word "akron'' (height) and "phobia'' (fear). It means fear of heights. Step 2: Eliminate other options
- "Claustrophobia'': Fear of confined or closed spaces.
- "Arachnophobia'': Fear of spiders.
- "Hydrophobia'': Fear of water (often associated with rabies). Conclusion: Only "Acrophobia'' correctly refers to the fear of heights.