Consider the following (fictitious) conclusion reached by a social psychologist: "After analyzing a sample of over 578 experiments, we have concluded that the question of whether men are more likely than women to help is difficult to answer. Based on the findings of this large number of studies, we have concluded that men are more likely to help when helping demands physical risk or 'chivalry;' otherwise, there are no reliable gender differences in helping." This conclusion about the reliability of the relation between gender and helping was most likely based on
A) pure conjecture.
B) surveys of researchers.
C) meta-analytic techniques.
D) correlational research.
E) experimental procedures.