Complete the sentences given in List-I with the appropriate verbs from List-II:

List-I	List-II
(Sentences)	(Verb Forms)
---	---
(A) We are planning an event which ______ soon.	(I) closes
(B) I must get to the post office before it _______.	(II) would have gone
(C) It is probably too late to call Ravi, he ______ to bed, surely.	(III) are going
(D) Forthcoming books are those that we think, ______ to be available soon.	(IV) will happen

Choose the correct answer from the options given below:

Option 1 -> (A)-(I) "event which closes soon" is incorrect; events happen, they don't close. (B)-(II) "before it would have gone" is wrong tense for this context.

Option 2 -> (A)-(IV) "event which will happen soon" ✓; (B)-(I) "before it closes" ✓; (C)-(II) "he would have gone to bed" ✓; (D)-(III) "are going to be available" ✓. All match grammatically and contextually.

Option 3 -> (A)-(I) "event which closes soon" is incorrect; (C)-(IV) "he will happen to bed" is nonsensical.

Option 4 -> (A)-(III) "event which are going soon" has subject-verb disagreement; (B)-(IV) "before it will happen" doesn't fit the post office context.

Hence, Option 2 -> Sentence (A) needs future tense for an upcoming event ("will happen"), (B) requires present tense for routine closing time ("closes"), (C) needs modal perfect to express probability about a past action ("would have gone"), and (D) requires near future construction for forthcoming books ("are going to be") -> correct