Concept: Matching conversational openers with appropriate responses based on context and common English usage.Explanation:We need to match each opening statement (i, ii, iii, iv) with the most suitable response (a, b, c, d). Let's look at each pair:(i) "How's it going?" is a common greeting asking about someone's well-being or current situation. The best response from the options is "Great." (b), as it directly answers the question.(ii) "Lovely weather!" is a statement about the weather. A natural and common response is to agree, like "Yes, it is." (d).(iii) "I'll be in touch" is a way of saying goodbye with the intention of contacting someone later. A suitable closing remark is "Bye for now." (c).(iv) "It has been very interesting talking to you." expresses satisfaction with the conversation. A reciprocal or appreciative response would be "Same here." (a).Putting these matches together, we get the sequence (i) -> (b), (ii) -> (d), (iii) -> (c), and (iv) -> (a).Answer:The sentences (i), (ii), (iii) and (iv) can be matched respectively as b, d, c, a. This corresponds to Option B.