If the discount is equal to one fifth of the marked price and the loss is half the discount, then the percentage of loss is

• A. <table><tr><td rowspan="2">10</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">%</td></tr><tr><td style="text-align: center;">9</td></tr></table>
• B. <table><tr><td rowspan="2">11</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">%</td></tr><tr><td style="text-align: center;">9</td></tr></table>
• C. <table><tr><td rowspan="2">12</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">%</td></tr><tr><td style="text-align: center;">9</td></tr></table>
• D. <table><tr><td rowspan="2">13</td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td><td rowspan="2">%</td></tr><tr><td style="text-align: center;">9</td></tr></table>