Which Statement About the R-K Continuum Is True

Which statement about the r-K continuum is true?

A) Most species are at one extreme or the other.
B) Most species are intermediate between the two extremes.
C) The distinction between r- and K-selection is more useful for comparisons of distantly related species than of closely related species.
D) The r- and K-selection classification system makes sense for thinking about plant life histories, but not for mobile animals.