The correct answer is B. Recluse.
A recluse is a person who lives in seclusion, avoiding social contact. They may do this for a variety of reasons, such as shyness, anxiety, or a desire for solitude. Recluses may live in isolation for long periods of time, and they may have difficulty interacting with others when they do venture out into the world.
An ascetic is a person who practices severe self-discipline and self-denial, often for religious or spiritual reasons. Ascetics may live a simple life, abstaining from material possessions and pleasures. They may also practice physical austerities, such as fasting, self-flagellation, or sleep deprivation.
An unsocial person is someone who is not interested in social interaction. They may be shy, introverted, or simply prefer to spend time alone. Unsocial people may find it difficult to make friends or maintain relationships.
An agnostic is a person who does not believe that it is possible to know whether or not God exists. Agnostics may be open to the possibility of God, but they do not believe that there is enough evidence to support any particular belief system.
In conclusion, the correct answer to the question “A person who lives alone and avoids other people” is B. Recluse.