Choose the appropriate compound adjective to complete the sentence:
Lily is a _________ girl. She is polite and humble.
A compound adjective is formed when two or more adjectives are joined together to modify the same noun. Further, only some compound adjectives can be used to describe a person or thing, based on the quality they describe. The given sentence speaks of a ‘girl’ thus ‘well-mannered’ is the apt answer. Since it means a person with good manners. Thus option C is correct. On the other hand, the other options cannot be used because they are generally not used to describe a person. ‘Brand-new’ means completely new and it is used to describe a thing/object. ‘Cold-blooded’ primarily denotes an animal with a different body temperature. Further, it can be used to mean a savage person, but here the second sentence states that the person is polite and humble so ‘cold-blooded’ will not be suitable. Lastly ‘300-page’ is used to describe a book or document which is once again not suitable. Thus options A, B, and D are incorrect.