If sin 21 =x , then sec 21 sin 69 is equal toy

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