Question

if human minds were as uniform as atoms of the same elements or molecules of the same chemical, psychological phenomena would be as ______ as chemical reactions. instead, most psychological phenomena seem to vary widely from case to case, and to show, at best, only a rough consistency in the aggregate. this means that psychologists require sophisticated methods of analysis to work out the relative strengths of the correlations between complex behaviors and the factors that contribute to them.
which choice completes the text with the most logical and precise word or phrase?
a explicable
b measurable
c predictable
d controllable

Explanation:

The text contrasts psychological phenomena with chemical reactions. Chemical reactions involving identical atoms/molecules follow consistent, predictable patterns. The "instead" clause notes psychological phenomena vary widely, so the blank needs a word describing the consistency of chemical reactions. "Predictable" fits this logical contrast best, as chemical reactions are reliably foreseeable, unlike the variable psychological phenomena.

Answer:

C. predictable