Which of the following is a key question to ask regarding the parties to a purchase agreement? Both of them. Is everyone with an ownership interest signing? None of them. Does everyone who is signing have the capacity to contract? If a purchase contingent on the buyer's ability to sell his or her home is not an express condition, it is often a(n): prerequisite condition. purchase option. illegal contract. hidden condition. Under the terms of the CAR purchase agreement form, the broker holds the deposit check: until the buyer tells him or her what to do with it. until the next business day, then it is cashed. until the seller has accepted the buyer's offer. for 7 days, then cashes it or returns it