Which of the following statements is (are) FALSE concerning extreme value distributions?
　　I.Using block maxima, local maxima may not resemble extreme observations.
　　II.Small tails reduce the variance of the estimator in cluster analysis.
　　III.The two classes of EVT models are block maxima and generalized extreme value distribution.
　　A. I and II only.
　　B. I and III only.
　　C. I, II, and III.
　　D. II and III only.
　　Answer:D
　　Small tails decrease the number of extreme observations increasing the variance. Block maxima and peaks-over-threshold are the two classes of EVT distributions.