Final answer:
A burglar is the correct answer to the question of who steals things from a house, as they specifically enter buildings with the intent to commit theft.
Step-by-step explanation:
The person who specifically steals things from a house is known as a burglar. This term is used to describe someone who illegally enters a building, often a home, with the intent to commit a crime, usually theft. The options given in the question represent different types of individuals who are involved in various illicit activities. A pickpocket is someone who steals from other people's pockets in crowded areas, a pirate is historically known as a person who commits robbery at sea, and a vandal is someone who deliberately damages property. Therefore, the correct answer to which person steals things from a house is A. Burglar.