If sin (A B) = sin A cos B cosA sinB, then sin 15 will be

• A. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <span style=" text-decoration: overline;">3</span> + 1</center></td><td rowspan="2"></td></tr><td align="center">2 <span style=" text-decoration: overline;">2</span></td></table>
• B. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <span style=" text-decoration: overline;">3</span></center></td><td rowspan="2"></td></tr><td align="center">2 <span style=" text-decoration: overline;">2</span></td></table>
• C. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <span style=" text-decoration: overline;">3</span> - 1</center></td><td rowspan="2"></td></tr><td align="center">- <span style=" text-decoration: overline;">2</span></td></table>
• D. <table><tr><td rowspan="2"></td><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> <span style=" text-decoration: overline;">3</span> - 1</center></td><td rowspan="2"></td></tr><td align="center">2 <span style=" text-decoration: overline;">2</span></td></table>