Which of the following best describes undue influence?

Undue influence is best described as a form of persuasion that overcomes an individual's free will and judgment. This concept is critical in real estate transactions and contracts, particularly when determining the validity of agreements made under pressure or manipulation. When one party exerts an excessive amount of influence over another, often due to a relationship of trust or dependence, the affected individual may not be able to exercise their own free will in making decisions. This can lead to agreements or decisions that do not truly reflect the individual's intentions or interests.

In the context of other options, financial leverage, coercive threats, and logical arguments entail different dynamics that do not fully encapsulate the complexities of undue influence. Financial leverage may suggest a power imbalance, but it does not inherently mean that free will is overridden. Coercion through threats indicates a situation of duress rather than the subtler manipulation implied by undue influence. Similarly, making convincing arguments relies on rational discourse rather than overpowering someone's judgment or will. Thus, the essence of undue influence remains the undermining of a person's ability to make independent, informed decisions.