<p>The discount is <b>valid</b> online on full-price items marked "40% off full-price with code “THANK YOU”.</p><p><span style="font-size: 13.008px;">The correct answer is (B) </span><b style="font-size: 13.008px;">valid</b><span style="font-size: 13.008px;">.</span><br></p>
<p>The word "valid" means that the discount is legitimate and can be used. In this context, it implies that the discount code "THANK YOU" is active and can be applied to the full-price items online. The other options are not appropriate in this context:</p><p><b style="font-size: 13.008px;">Defective</b><span style="font-size: 13.008px;"> means that something is broken or not functioning properly. It does not make sense to use this word to describe a discount.</span></p><p><b style="font-size: 13.008px;">Affordable</b><span style="font-size: 13.008px;"> means that something is reasonably priced and within one's budget. While a discount can make an item more affordable, it is not the best word to describe the validity of a discount.</span></p><p><b style="font-size: 13.008px;">Confidential</b><span style="font-size: 13.008px;"> means that something is kept secret or private. This word does not fit the context of a discount on full-price items.</span></p>