<p>KBC Market accepts returns, in the country where <strong>defective</strong> merchandise purchased in our retail stores for a full refund or exchange within 30 days of original purchase.</p>
<p>The correct answer is <strong>(C) defective</strong>.</p>
<p>The word "defective" fits grammatically and semantically in the sentence. It indicates that the merchandise purchased may have some faults or flaws, which is a valid reason for returning it.</p>
<p>Option (A) "correct" does not make sense in this context. It does not provide any information about the condition of the merchandise.</p>
<p>Option (B) "tentative" means uncertain or hesitant, and it does not relate to the condition of the merchandise.</p>
<p>Option (D) "consecutive" means following continuously, and it does not describe the merchandise's condition.</p>