The correct answer is C. nettlesome : annoying.
Feral means wild or untamed, while tame means domesticated or gentle. Nettlesome means causing annoyance or irritation, while annoying means causing someone to feel bored, frustrated, or irritated. Both nettlesome and annoying are words that describe something that is unpleasant or disagreeable.
The other options do not have a similar relationship to the original pair of words. Rancid means having a bad smell or taste, while rational means based on or in accordance with reason or logic. Repetitive means happening or done again and again, while recurrent means happening again and again at intervals. Repentant means feeling or showing regret or remorse for one’s sins or wrongdoings, while honorable means having or showing high moral standards. Ephemeral means lasting for a very short time, while immortal means living forever.