Correct Answer:
Option B - Word 'useful' is in adjective form. An Adjective is a word that describes or clarifies a noun. Adjectives describe nouns by giving some information about an object's size, shape, age, color, origin or material.
B. Word 'useful' is in adjective form. An Adjective is a word that describes or clarifies a noun. Adjectives describe nouns by giving some information about an object's size, shape, age, color, origin or material.