对于金融期权交易双方开立保证金账户的规定，下列说法正确的是( )。

A．交易双方均需开立保证金账户

B．交易卖方必须开立保证金账户，而买方无要求

C．交易买方必须开立保证金账户，而卖方无要求

D．交易双方均无需开立保证金账户

All the historic sites within the range of Three Gorges Reservoir have been ______ to some new

locations high above.[ ]

A. transformed  

B. transmitted

C. transferred  

D. transported