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$[$Garage Sale$]$ While cleaning out his garage, Ezra offers to sell Mia a used computer for $$200.$ Mia replies, "I'll think about it and buy it if I decide to do so$."$ Ezra also calls Irina and offers to sell Irina a used business law book for $$50.$ She asks if she can clean his apartment in exchange for the book, instead of paying cash, and he agrees. Ezra also agrees to sell a communications book for $$5$ to Tam, who promises to pick it up the next day. Meanwhile, Diego comes to visit and offers Ezra $$45$ for the business law book. Ezra sells it to him because he decides his apartment is clean enough. Diego also offers Ezra $$50$ for the used computer. Ezra sells it to Diego because he does not expect to hear from Mia. Diego sees the communications book and offers Ezra $$45$ for it$.$ Ezra decides to forget about Tam and proceeds to sell the book to Diego for $$45.$ The next day Irina shows up to clean Ezra's apartment and is very angry because Ezra did not save the book for her. Irina claims that Ezra breached their contract because they had a deal. Ezra says that they never had aldeal because no consideration was present. He also says that even if cleaning house would be considered consideration, any housekeeping done would have been wholly inadequate to support receipt of the book because his house was already clean. Tam is also angry because Ezra sold the communications book, and informs him that he breached the contract he had with her. Ezra tells her that he had no obligation to hold the book for her because they had a unilateral contract. Two days after they first spoke, Mia tells Ezra that she would like the computer. She tells him that her response bound him and that he should have awaited her action. Ezra tells Diego that he needs to return everything for a full refund. Diego refuses.

Which of the following is true regarding whether Ezra breached a contract with Mia?