Adam Farman has been asked to estimate the volatility of a technology stock index. He has identified a statistic which has an expectedvalue equal to the population volatility and has determined that increasing his sample size will decrease the sampling error for this statistic. His statistic can best be described as:
　　A. Unbiased and efficient.
　　B. Unbiased and consistent.
　　C. Efficient and consistent.
　　D. Unbiased only.
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