This same scenario is used for questions #5 and #6.

Juanita finds a dream home in the foothills. She wants to buy it but is unsure whether she can get a loan. She signs a contract with the seller that she will buy the home if she can get a loan. Juanita also includes a contractual clause in the contract with the seller that if she loses her job before the date the purchase contract is signed, the seller will release her from any obligation.

The provision that Juanita did not have to buy the house unless she was able to get a loan is referred to as which of the following?