Researchers Found That as the Flock Size of European Goldfinch

Researchers found that as the flock size of European goldfinch (Carduelis carduelis) increased, the time needed to find new food patches also increased because large populations

A) have high per capita food consumption.
B) are forced to live in lower-quality habitat.
C) have more aggressive individuals.
D) depleted the food source in the original patch more quickly.