Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

Acrophobia, a term used to describe an intense fear of heights, ___(1)___. People with this condition experience overwhelming anxiety when they are in high places, such as tall buildings, bridges, or even mountains. This fear can sometimes be triggered by just the thought of being at a height, making it difficult for individuals to function in everyday situations. It can significantly impact one's daily life.
The causes of acrophobia can vary from person to person. Often, it develops after a traumatic experience involving heights, such as a fall or a near-accident. In some cases, acrophobia is believed to be genetically inherited. Individuals ___(2)___ are more prone to developing this fear. Additionally, learned behaviors from watching others react fearfully to heights may also contribute to the onset of this phobia.
Treatment for acrophobia typically involves therapy, with cognitive behavioral therapy (CBT) being the most effective. ___(3)___. In some cases, exposure therapy may be used. ___(4)___. Medications may also be prescribed to help manage anxiety during treatment.
Acrophobia, when left untreated, can severely limit a person's life and activities. Overcoming acrophobia requires patience and persistence, but with the right treatment, many people find they can lead more fulfilling lives. ___(5)___, they were able to overcome their fear and improve their quality of life significantly.