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In a recent field study of prairie plants, the more plant species a prairie plot had, the more vigorously the plants grew and the better the soil retained nutrients. Thus, having more plant species improves a prairie's ability to support plant life.
9.
The argument is most vulnerable to criticism on the grounds that it
a
infers of two correlated phenomena, X and Y, that X causes Y without considering whether Y causes X
b
fails to describe the mechanism by which productivity is supposedly increased
c
takes for granted that the characteristics of one prairie plot could reveal something about the characteristics of other prairie plots
d
bases a general conclusion on data that is likely to be unrepresentative
e
takes an increase in number to indicate an increase in proportion