From the words or group of words lettered A to D, choose the word or group of words that best completes each…

Analyze the question: The sentence is "Everyone wants to be the __ favourite." We need the correct possessive form to show whose favourite it is: the favourite of the principal of the school.

Concept: When a noun is used to describe another noun (a noun adjunct), it usually stays in its plain form (e.g., school principal, school bus, school uniform). The possessive apostrophe goes on the head noun that "owns" the thing, which here is principal. So the pattern is: [modifier noun] + [possessor]'s + noun, as in the school principal's favourite.

Step-by-step check of the options:

• A. school principal – There is no possessive, so "the school principal favourite" is ungrammatical. ❌
• B. school's principal's – This uses two possessives in a row, which is awkward and wrong here. ❌
• C. school principal's – "School" describes what kind of principal, and "principal's" shows possession: the school principal's favourite. ✅
• D. school's principal – This is missing the possessive on "principal", so the sentence doesn't work. ❌

Answer: "Everyone wants to be the school principal's favourite."

Tip: Ask yourself, "Who owns the favourite?" The principal does, so the apostrophe-s goes on principal. Words like school that just describe the type of principal remain plain, as in school bus driver's licence.