A seller must close by December 31 to avoid substantial income tax liability. Which of the following contract clauses may be most beneficial to the seller's situation?

This clause gives a party the right to purchase the property before the seller can sell to another buyer. While it can be beneficial in some contexts, it does not specifically address the urgency of closing by a particular date, making it less relevant for the seller's need to avoid tax liabilities.

An acceleration clause allows a lender to demand full repayment of a loan if certain conditions are met, typically relating to default. Although it can expedite payment under specific circumstances, it does not directly facilitate the seller's closing timeline and thus does not provide the necessary urgency to meet the December 31 deadline.

Subrogation refers to the right of one party to step into the shoes of another party to claim their rights, often seen in insurance contexts. This clause does not address the closing timeline and is unrelated to the seller's immediate concern of completing the sale by a specific date to avoid tax implications.