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【单选题】
假设某一时刻股票指数为2280点，投资者以15点的价格买入一手股指看涨期权合约并持有到期，行权价格是2300点，若到期时股票指数期权结算价格为2310点，则投资者收益为()。
A.
10点
B.
-5点
C.
-15点
D.
5点
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