Answer:
The answer is b. phobic disorder.
Explanation:
Also known as "phobias", phobic disorders are characterised by a strong, persistent fear to a certain object or situation. Phobias are manifested in a much more pronounced way than simple fears, even if the situation is not particularly menacing.
Comon phobias are aracnophobia (fear of spiders) and acrophobia (fear of heights).