影响期权价格的最主要原因是（）。
A.期权的执行价格
B.标的物资产的现价
C.标的物资产价格的波动
D.合约的期限
参考答案：C
During the tourist season, there are many people wandering in this city to see the old castles _____ in the sixteenth century.
A．to be built
B．being built
C．having been built
D．built
“掌尚钱包”是农业银行掌上银行（智芯系列）业务的专有品牌名称。
