Option 1 -> (A)-(II) is incorrect; "amongst" doesn't fit for sitting next to one person.
Option 2 -> (A)-(I) is incorrect; "besides" means "in addition to," not "next to."
Option 3 -> (A)-(I) and (D)-(III) don't work; "besides" is wrong for physical position, and "between" should be used for two entities not "amongst."
Option 4 -> (A) needs "beside" (IV) for physical proximity; (B) needs "besides" (I) meaning "in addition to"; (C) needs "amongst" (II) for multiple council members; (D) needs "between" (III) for two specific entities (mountains and river).
Hence, Option 4: (A) - (IV), (B) - (I), (C) - (II), (D) - (III) -> "Beside" indicates physical position next to someone, "besides" means in addition to, "amongst" is used for more than two people, and "between" is used when referring to two distinct entities -> correct