Option 1 -> (A) "over" - bridges span over rivers; (B) "across" - waiting on the opposite side; (C) "among" - distributing within a group; (D) "against" - leaning in contact with the wall. All prepositions fit correctly.
Option 2 -> (A) "among the river" is grammatically incorrect - you cannot build something among a single entity.
Option 3 -> (C) "distributing sweets against his friends" is inappropriate - "against" implies opposition, not sharing.
Option 4 -> (B) "waiting against the road" is incorrect - "against" doesn't convey the intended meaning of location.
Hence, Option 1: (A) - (II), (B) - (III), (C) - (IV), (D) - (I) -> Each preposition aligns with standard English usage: "over" for spanning above, "across" for opposite sides, "among" for distribution within a group, and "against" for physical contact/support -> correct