(Video: Activity, Exercise, and the Brain) in a Research Study

(Video: Activity, exercise, and the brain) In a research study, one group of adult rats was placed in an "enriched" environment, the other group in individual barren laboratory cages. The researchers found that, compared to the brains of the "deprived" rats, those of rats living in enriched environments

A) were smaller.
B) had fewer neural connections.
C) had greater blood supply.
D) were the same.