Which of the Following Represents an Arbitrage Transaction

Which of the following represents an arbitrage transaction?

A) Traders buy silks where they are abundant and cheap, and haul them along a trail to another place where they would be quite scarce and valued.
B) A trader buys a block of government bonds in one market where it is temporarily priced below where it can be immediately resold in a different market.
C) Someone buys a block of Final Four tickets and scalp them at the game.
D) A senior citizen buys a block of theater tickets at a senior discount and scalps them to teenagers behind the theater.
E) All of the above are example of arbitrage.