单选题:某交易者以7340元/吨买入10手7月白糖期货合约后,下列符合金字塔式增仓原则操作的是(  )。

题目内容:
某交易者以7340元/吨买入10手7月白糖期货合约后,下列符合金字塔式增仓原则操作的是(  )。 A.白糖合约价格上升到7350元/吨时再次买入9手合约
B.白糖合约价格下降到7330元/吨时再次买入9手合约
C.白糖合约价格上升到7360元/吨时再次买入10手合约
D.白糖合约价格下降到7320元/吨时再次买入15手合约

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