Option 1: (B), (D), (A), (C) -> Forms: "Sea travel is normally on a ferry, and the journey is called a crossing, but you can have a holiday on the sea if you go on a cruise" - logical flow with proper contrast.
Option 2: (C), (D), (A), (B) -> Starts with incomplete fragment "the sea if you go on a cruise" - grammatically incorrect.
Option 3: (B), (A), (D), (C) -> Creates: "...but you can have a holiday on and the journey is called..." - breaks sentence flow and lacks coherence.
Option 4: (C), (B), (D), (A) -> Begins with dependent clause and ends abruptly - no grammatical structure.
Hence, Option 1: (B), (D), (A), (C) -> This arrangement creates a coherent sentence that first describes normal sea travel (ferry and crossing), then uses "but" to contrast it with recreational sea travel (cruise holiday). The sentence maintains proper grammatical structure and logical progression -> correct