Match the idioms given in List-I with their meanings given in List-II:

List-I	List-II
(Idioms)	(Meanings)
(A) get into the swing of things	(I) follow the wrong course of action
(B) bark up the wrong tree	(II) to fit into the rhythm of things
(C) build something on sand	(III) expose someone's deceitful or illegal schemes
(D) blow the whistle on someone	(IV) to try to establish something without enough support

Choose the correct answer from the options given below:

Option 1 -> (A)-(I), (B)-(II), (C)-(III), (D)-(IV) - Incorrect matching as "get into the swing of things" doesn't mean following wrong course, and other pairings are misaligned.

Option 2 -> (A)-(II), (B)-(I), (C)-(IV), (D)-(III) - Correct matching: "swing of things" = fit into rhythm; "bark up wrong tree" = wrong course; "build on sand" = without support; "blow whistle" = expose schemes.

Option 3 -> (A)-(I), (B)-(II), (C)-(IV), (D)-(III) - Incorrect as (A) and (B) are wrongly matched from the start.

Option 4 -> (A)-(III), (B)-(IV), (C)-(I), (D)-(II) - Completely incorrect alignment of all idioms with their meanings.

Hence, Option 2: (A)-(II), (B)-(I), (C)-(IV), (D)-(III) -> "Get into the swing of things" means to adapt and fit into the rhythm; "bark up the wrong tree" means pursuing the wrong approach; "build on sand" refers to creating something without solid foundation; and "blow the whistle" means to expose wrongdoing -> correct