Choose the one which is nearest in meaning to
IMPASSE

• Concept: Synonyms are words that have the identical meaning as a given word.
• Generally, words within the English have many synonyms bearing similar meanings.
• A thesaurus may be a book that contains of these synonyms in one place.
• Let us observe some samples of synonyms.
• Astonishing is an adjective meaning to be impressive or amazing. 
• Stalemate is a condition in which both side able to win or progress.
• Stalemate is nearest to impasse.

Hence, option A is the correct answer.