Only teachers could afford a car. This means that

Analyze the question: This is an "interpretation of sentences" question. You must find the option that keeps the meaning of the original sentence, especially the word "only."

Explain the concept: "Only + noun" restricts the action to that group and excludes everyone else. "Only teachers could afford a car" means that among all people, teachers were the sole group able to afford one.

Step by step:

• A. "teachers could afford a car and nothing else": This restricts the thing afforded (a car and nothing else). The original restricts the people, not the item. Wrong.
• B. "teachers and nobody else could afford a car": This restricts the people to teachers alone, which matches the original. Correct.
• C. "teachers and others could afford a car": This adds other people, which contradicts "only." Wrong.
• D. "few teachers could afford a car": This is about the quantity of teachers, not about who is excluded. The original does not say that few teachers could afford one. Wrong.

Tip: In "only + X" sentences, ask yourself, "Who or what is being excluded?" The word "only" usually limits the word right after it. Here it limits teachers, so the correct option must say "nobody else." Watch for distractors that shift "only" onto a different part of the sentence, like option A does.