The selling price of 12 articles is equal to the cost price of 15 articles. The gain percent is

• A. <table><tr><td rowspan="2"> 6</td> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>2</center></td><td rowspan="2">%</td></tr><td align="center">3</td></table>
• B.
• C. 20%
• D. 25%
• E. 80%