Robbery is defined as:

Robbery is defined as unlawfully taking property using fear or intimidation, which is why this choice is the correct answer. This definition captures the essential elements of robbery: it involves not only the unlawful taking of someone else's property but also the element of coercion. This means that the person committing the robbery uses threats or intimidation to instill fear in the victim, which contributes to the crime's severity and categorization as a felony in many jurisdictions.

The other options do not capture the full essence of robbery. Theft without violence refers more to larceny or simple theft, which does not involve the use of fear or intimidation. A legal transfer of property describes transactions that are lawful and agreed upon by both parties, which is contrary to the illegal nature of robbery. A mutual agreement between parties likewise implies consent and legality, far removed from the forceful nature of robbery.