Select the word opposite in meaning to the underlined word.

At first the workers were not agreeable to the proposals of their Manager, but later they were reconciled to the new proposals.

resistant

The correct answer is Option (1) - resistant

The best antonym for the underlined word "reconciled" is: resistant

Reconcile means to accept something unpleasant or different after a period of disagreement or objection. Resistant : implies opposition or unwillingness to accept something. This directly contrasts with "agreeable" which means accepting or willing to agree.
Estranged : implies a state of distance or hostility. This word means being separated or alienated from something or someone. While it might be applicable in certain contexts, it doesn't directly contrast with "reconciled" in this sentence, as it implies a different type of relationship dynamic.
Cooperate : means to work together for a common purpose. It's not the opposite of reconcile, in fact, cooperation often stems from agreement.
Agreed : is the past tense of "agree" and thus not opposite of reconcile.

Therefore, "resistant" best captures the opposite meaning of "agreeable" in this situation.