Which of the following is the fear of climbing?

Climacophobia

The correct answer is Climacophobia. It is the fear of climbing. The word "climac" comes from the Greek word for "ladder". People with climacophobia may avoid climbing altogether, or to experience severe anxiety when they are around heights or climbing structures.

The other options are:

• Cyberphobia: fear of computers or the internet
• Chromophobia: fear of colors
• Coulrophobia: fear of clowns