From the words lettered A to D below each of the following sentences, choose the word or group of words as it…

Analyze the question: This is a synonym question. You are asked to choose the word closest in meaning to "durable" as used in the sentence "It's always better to buy durable products."

Explain the concept: "Durable" describes something that can withstand wear, pressure, or damage and stays in good condition for a long time. It is about lasting a long time under use, not about price or genuineness.

Step-by-step solution:

• A. authentic means genuine or real. A product can be authentic but still break quickly, so this is wrong.
• B. expensive means high in price. Costly goods are not always durable, so this is wrong.
• C. permanent means lasting forever or unchanging. It is close, but "permanent" is too strong. No product lasts forever, and "permanent" suggests something fixed, like permanent ink or a permanent job. So it is not the best fit.
• D. lasting means continuing to exist or remain useful over a long time. This matches "durable" best.

Answer: The best synonym is lasting, which is option D.

Tip: In synonym questions, check the exact shade of meaning. Words like "permanent" may look right, but they are often too extreme. Look for the option that matches the word's meaning in the context. A helpful link is that "durable" comes from the Latin durare, "to last," so "durable" = "lasting."