Directions: Read each sentence to find out whether there is any grammatical or idiomatic error in it. In the following sentences, a part is highlighted in each sentence which is error-free, the error, if any, will be in any other part of the sentence. The letter of that part is the answer. If there is 'No error', the answer is (e). (Ignore errors of punctuation, if any). Two studies published in (A)/ **international journals have**/ found a worrying link among (B)/ air pollution levels and (C)/ the incidence of type 2 diabetes in Chennai and Delhi. (D)

### Concept & Grammar Rule Preposition Usage: "Between" vs. "Among". Use "between" when discussing distinct, specific entities (often two, but can be more if distinct). Use "among" for a broad, non-distinct collective group of three or more. ### Step-by-Step Solution - The sentence discusses a connection involving two distinct specific things: "air pollution levels" and "the incidence of type 2 diabetes". - Part (B) uses the preposition "among" to link these two concepts. - Because there are two distinct subjects being directly linked, the correct preposition is "between". - The correct phrase should be "found a worrying link between". ### Exam Strategy & Shortcut When you see the word "link", "relationship", or "connection" followed by two items separated by "and", the preceding preposition must almost always be "between", not "among". ### Common Pitfall Assuming "among" is correct just because the entities themselves might involve large populations or plural nouns (like "levels"), rather than counting the number of distinct entities being compared. ### Final Answer Therefore, the correct answer is **B**.