GRE Reading Comprehension: ETS Official Practice 150-GRE OP150: 阅读 - 4I1KJ6K13I6Z2I5IZ

According to the passage, which of the following factors were considered from the 1970s to the mid-1980s to influence the division of labor among a colony's worker ants? A. Ants' inherited traits B. The age of the ants C. The ants' experiences outside the nest