If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be

• A. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>R</center></td><td rowspan="2"></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">4</td><br></tr></table>
• B. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>R</center></td><td rowspan="2"></td><td rowspan="2"> </td></tr><tr><td style="text-align: center;">4</td><br></tr></table>
• C. R
• D. 2R