Solution:Concept- The given dialogue in this question includes Mrs. K asking an imperative question to Nita, who’s response we have to determine from the given options.
An imperative sentence/question is the type of sentence/question that gives instructions or advice, and expresses a command, an order, a direction, or a request.
Here, that request is made to Nita, who is requested to come attend Mrs. K’s party.
The most suitable reply to such an imperative statement is option (d.) , which is “Sure, I'll be there. Arun's back, is he? It'll be nice to see him again.”
This is because the remaining given options are either interrogative (option a.) or simply a statement (option b and c) instead of a reply to an imperative question.
Hence, the correct answer is option 4.