The Minecart with Spawner is an item that is essentially just a spawner placed in a minecart. It cannot be obtained by the player in the survival game modes or even through the creative inventory. The only way to get a Minecart with Spawner is through the use of the commands.
The Minecart with Spawner cannot be obtained in any of the game modes, this includes the creative inventory as well. The use of commands is the only way to a Minecart with Spawner. Players can use the summon command to get themselves a Minecart with Spawner.
The Minecart with Spawner is a special item that can only be obtained through the use of commands. A lot of map builders use the Minecart with Spawner to spawn custom or specific entities for their player-made maps.
A. No, you players can only get a Minecart with Spawner through the use of commands.
A. You can pick up a Minecraft with Spawner by simply breaking it with a tool or you hand.