Antonym of OBSTINATE

Answer: Option C

Obstinate : stubbornly refusing to change one's opinion or chosen course of action, despite attempts to persuade one to do so.
Inflexible : unwilling to change or compromise.
Prominent : important; famous.
Pliable : easily influenced.
Fashionable : characteristic of, influenced by, or representing a current popular style.

Antonym of Obstinate is Pliable