A person who lives by himself

Answer: Option D

One word substitute is Recluse.

Venerable: accorded a great deal of respect, especially because of age, wisdom, or character.
Sage: an aromatic plant whose greyish-green leaves are used as a culinary herb, native to southern Europe and the Mediterranean.
Quietus: death or something that causes death, regarded as a release from life.
Recluse: a person who lives a solitary life and tends to avoid other people.