Final answer:
All parties listed - buyer, seller, lender, and escrow agent - may request specific performance when damages are not adequate in contract law.
Step-by-step explanation:
In contract law, specific performance is a remedy that may be requested when damages are not adequate. It involves a party to a contract requesting that the other party fulfill their contractual obligations exactly as specified. In this case, all of the options listed - buyer, seller, lender, and escrow agent - may request specific performance when damages are not adequate.