Synonym of STUBBORN

Answer: Option B

Easy : achieved without great effort; presenting few difficulties.
Obstinate : stubbornly refusing to change one's opinion or chosen course of action, despite attempts to persuade one to do so.
Willing : ready, eager, or prepared to do something.
Pliable : easily bent; flexible.
Stubborn : having or showing dogged determination not to change one's attitude or position on something, especially in spite of good arguments or reasons to do so.

Synonym of Stubborn is Obstinate