Which of the following represents a unilateral offer?
a. Tyrone, a men's clothing store owner, signs a contract with one of his suppliers that says he will only buy shirts from that supplier exclusively.
b. Kris agrees to buy Tony's old iPod but then changes her mind.
c. Aisha loses her diamond ring at work, offers a $50 reward for its return, and Jason finds the ring and collects the reward.
d. Bobby and Billy notice fliers around their neighborhood offering $50 for the return of a lost cat so they go looking for the cat.
Answer: C
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