. . . . . . . . whom do the people work and earn?

This question tests understanding of prepositions and their usage in forming grammatically correct sentences. The sentence requires a preposition that indicates the beneficiary or employer for whom the people work and earn. Preposition Definition:
A preposition is a word that shows the relationship between a noun or pronoun and other words in the sentence. It indicates location, time, direction, manner, or other relationships. Correct Answer: B. For
The preposition "for" correctly indicates that the work and earnings are done on behalf of or to benefit someone or something. The complete sentence would be: "...for whom do the people work and earn?" This is grammatically correct and makes sense. Why other options are incorrect:
A. In: "In" indicates location or enclosure. It doesn't make logical sense to say "...in whom do the people work and earn?"
C. Why: "Why" is an interrogative adverb asking for a reason, not indicating a beneficiary.
D. Around: "Around" indicates location or proximity. It's grammatically incorrect and doesn't fit the context.