The correct answer is C. Island platform.
An island platform is a type of railway platform that is surrounded by rail lines on all four sides. It is typically used at stations where there is a lot of passenger traffic, as it allows passengers to board and disembark from trains on both sides.
A dock platform is a type of platform that is located next to a dock or pier. It is typically used for loading and unloading cargo from ships.
A passenger platform is a type of platform that is used for boarding and disembarking passengers from trains. It is typically located between the tracks.
A goods platform is a type of platform that is used for loading and unloading goods from trains. It is typically located next to the tracks.