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The correct answer is: "flushed."<br /><br />Explanation: In the context of the question, the term "flushed" refers to the process of preparing a mare for embryo transfer. This involves stimulating the mare's reproductive system to produce multiple eggs, which are then collected and used for fertilization. The other options, such as "is fertilized," "is checked for using an ultrasound machine," and "pregnancy," are related to the subsequent steps in the embryo transfer process but do not describe the initial step of preparing the mare.