The teacher explained the rule in simple ______.

• A. Terms
• B. Examples
• C. Language
• D. Style

Answer: (A)

The idea being tested is the natural way to describe explaining something clearly. The expression “in simple terms” is a fixed, common collocation that means to explain something in a way that’s easy to understand. So the sentence reads naturally as “The teacher explained the rule in simple terms.” The plural noun terms is the usual word in that phrase, signaling a straightforward, plain explanation.

Other options don’t fit as well. “In simple examples” sounds awkward because we don’t typically explain something by giving simple examples in that fixed form. “In simple language” is grammatical and possible, but it’s less idiomatic for describing how an explanation is clarified; it doesn’t convey the same emphasis on making the explanation easy to grasp as “in simple terms.” “In simple style” is not a natural expression in this context.