Final answer:
A store cashier who takes $20 from the cash register they are responsible for is guilty of embezzlement, as they misappropriate the funds they were trusted with.
Step-by-step explanation:
A store cashier who steals $20 from the cash register is guilty of embezzlement. Embezzlement is the crime of theft or misappropriation of funds placed in one's trust or belonging to one's employer. In the provided scenario, since the cashier had legal access to the money as part of their employment but then took it for their own use, this constitutes embezzlement. This differs from larceny where the property is taken without ever having had a legal right to access it, and burglary, which involves unlawful entry to commit a theft. Fraud involves deception to achieve financial gain, which does not fit the scenario of simply taking money directly from the cash register.