GRE Reading Comprehension: ETS-GRE阅读ETS - JW615LC41FX5TI4E7

The author would be most likely to agree with which of the following statements about left-eyedness and right-eyedness in the starry flounder? A. They are adaptive variations by the starry flounder to environmental differences. B. They do not seem to give obvious selective advantages to the starry flounder. C. They occur in different proportions in different locations.