6466. He is very discreet while deciding such matters.

✅ The correct answer is option C.
Obstinate : stubbornly refusing to change one’s opinion or chosen course of action, despite attempts to persuade one to do so.

Cunning : having or showing skill in achieving one’s ends by deceit or evasion.

Prudent : acting with or showing care and thought for the future.

Trustworthy : able to be relied on as honest or truthful.

Discreet : careful and prudent in one’s speech or actions, especially in order to keep something confidential or to avoid embarrassment.

Synonym of Discreet is Prudent