Which of the following defines "slander"?

The definition of "slander" pertains to the act of making a false spoken statement that damages a person's reputation. In this context, "an untruthful spoken attack" encapsulates the essence of slander, which is typically considered a form of defamation. To slander someone is to verbally present false information about them in a way that can cause harm to their standing or character in the eyes of others.

The other options do not align with this definition: a written compliment refers to a positive expression, a legal agreement involves contractual obligations rather than defamation, and a factual statement, by nature, cannot be slanderous since it is true. Thus, "an untruthful spoken attack" accurately captures the concept of slander in its most precise form.