Answer:
A characteristic and trait.
Explanation:
Synonyms are words that have or relate to the same meaning. These words are different in their spellings and words but they all mean the same thing.
Among the given options, the words "characteristic" and "trait" are the closest synonyms. 'Characteristic' means the feature or quality that makes someone or something unique. Likewise, the word "trait" refers to the quality or character that distinguishes it from others.
Thus, the correct answer is option A.