7811. During negotiations, the Managing director remained obdurate.

✅ The correct answer is option A.
Adamant : refusing to be persuaded or to change one’s mind.

Tough : (of a substance or object) strong enough to withstand adverse conditions or rough handling.

Co-operative : involving mutual assistance in working towards a common goal.

Flexible : capable of bending easily without breaking.

Obdurate : stubbornly refusing to change one’s opinion or course of action.

Synonym of Obdurate is Adamant