Final answer:
Option (C) Sally ordering a pizza to be delivered, is not an example of an express agreement, unlike the other options which involve clear verbal or written contracts.
Step-by-step explanation:
The question asks to identify which scenario is not an example of an express agreement. An express agreement is a clearly stated contract or terms of agreement, either in writing or verbally. Looking at the given options: (A) represents an express agreement since Al and Fred agreed on selling the car; (B) is also an express agreement as Donna signs loan papers for the purchase, which are documented terms; and (D) is an express agreement where Ted signs a written lease for an apartment. (C), Sally ordering a pizza to be delivered, is not necessarily an express agreement in the same sense as the others because it is an implied contract that comes from her placing the order without necessarily discussing detailed terms of delivery. Thus, the answer to which is not an express agreement is (C).