If a distribution exhibits positive skewness, then the mean is most likely located to the:()

A. left of both the median and mode.

B. right of both the median and mode.

C. left of the median and right of the mode.

某研究组获得了水稻的叶黄素缺失突变体。对其叶片进行了红光照射，光谱吸收测定和色素层析条带分析（从上至下），与正常叶片相比，实验结果是（）

A.光吸收差异显著，色素带缺第2条

B.光吸收差异不显著，色素带缺第2条

C.光吸收差异显著，色素带缺第3条

D.光吸收差异不显著，色素带缺第3条