Explanation:

Judgement means the ability to make considered decisions or come to sensible conclusions.

Progress means advancement. Policy means a strategy or an approach.

Dissent means lack of approval. Action means activity. The Board members are usually involved in making decisions/ judgements.

"Unanimous" is an adjective which means (of two or more people) fully in the agreement.

It can appropriately modify the noun 'judgement'. No other word except 'judgement' makes sense in the given context. Hence, 'judgement' is the correct