Percentage of decrease in the number of accidents from May to June is :

• A. <table><tr><td rowspan="2">15 </td> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>4</center></td><td rowspan="2">%</td></tr><td align="center">7</td></table>
• B. <table><tr><td rowspan="2">27</td> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>3</center></td><td rowspan="2">%</td></tr><td align="center">7</td></table>
• C. <table><tr><td rowspan="2">22</td> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>6</center></td><td rowspan="2">%</td></tr><td align="center">7</td></table>
• D. <table><tr><td rowspan="2">18</td> <td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>5</center></td><td rowspan="2">%</td></tr><td align="center">7</td></table>