What type of contract is formed when one party agrees to sell another party property for a certain amount of money and the agreement is in writing?

A This option is incorrect because an implied bilateral contract does not involve a written agreement, rather, the contract is formed through actions of both parties. B: This option is incorrect because an express unilateral contract is one where only one party makes a promise and the other party performs an act in exchange, there is no property sale involved. C: This option is incorrect because a tacit unilateral contract is based on the actions and behavior of the parties, rather than a written agreement. D: This is the correct answer because an express bilateral contract involves both parties agreeing to certain terms in writing, making it the most suitable option for the scenario described.