Wilcoxon Et Al

Wilcoxon et al. (1971) demonstrated the importance of biological predispositions for learning when their research revealed that after being made ill from drinking blue, sour-tasting water, _____.

A) both birds and rats later avoided drinking either blue or sour-tasting water
B) only rats later avoided drinking sour-tasting water
C) only rats later avoided drinking blue water
D) both birds and rats later avoided drinking sour-tasting water but not blue water