The event likely to happen is that someone stole her old checkbook out of the trash. Therefore, the correct option is (A).
A Checkbook refers to the small book which contains the printed pages on it and is issued to check the account of the account holder and it used to pay the money for purchasing the goods and services.
According to the above scenario, Kiara had thrown away her old checkbook and someone is using it. It implies that someone has stolen the checkbook from the trash.
Therefore, the correct option is (A).
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