Synonym of TENEBROUS

Answer: Option B

Obstinate : stubbornly refusing to change one's opinion or chosen course of action, despite attempts to persuade one to do so.
Gloomy : dark or poorly lit, especially so as to appear depressing or frightening.
Fragile : (of an object) easily broken or damaged.
Overhanging : hanging or extending outwards over something.
Tenebrous : dark; shadowy or obscure.

Synonym of Tenebrous is Gloomy