A bond has a duration of 14.4 and a convexity measure of 85. If yield increases by 75 basis points, the percentage price change is closest to:（）

A. -5.16%

B. -10.32%

C. -11.28%

金融期权的买方在付出了一定数量的期权费后，在一定期限内必须服从卖方的选择并履行成交的允诺。( )