Which of the following is a method of contract discharge through events outside of the parties' control?

Impossibility of performance is considered a method of contract discharge that occurs due to unforeseen events that are outside the control of the parties involved. This legal principle applies when an event happens that makes it impossible to fulfill the contractual obligations, such as natural disasters, changes in law, or other significant occurrences. When such events arise, they serve to release the parties from their contractual duties, as the circumstances make performance not just difficult but impossible.

In contrast, breach refers to a failure to meet the terms of a contract, often resulting in liability for damages, and requires one party to not fulfill its obligations, which is within their control. Rescission involves both parties mutually agreeing to terminate a contract, thereby discharging their obligations through mutual consent rather than external circumstances. Mutual agreement itself is a decision made by the parties, rather than an uncontrollable event leading to discharge.

Understanding the distinction between these methods is crucial for recognizing how and when contracts may be nullified based on external factors versus the actions of the parties involved. Impossibility of performance underscores the importance of considering external risks and unforeseeable events in contract law.