Explanation: The synonym of 'Malignant' that is not appropriate is Option B: benign. Explanation: 'Malignant' refers to something harmful or virulent, while 'benign' has the opposite meaning—non-threatening or mild. Options A, C, and D are correct synonyms for 'malignant' as they represent harmful, spiteful, or malevolent characteristics. Note: Understanding synonyms and antonyms helps in precise language usage and improves vocabulary.
