Antonym of STUBBORN

Answer: Option C

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.
Willing : ready, eager, or prepared to do something.
Consenting : give permission for something to happen.
Pliable : easily influenced.
Easy : achieved without great effort; presenting few difficulties.

Antonym of Stubborn is Pliable