When Comparing the Brains of Rats Raised in a Rich

When comparing the brains of rats raised in a rich environment requiring lots of learning and motor behaviour with the brains of rats raised as 'couch potatoes' (Greenough et al., 1990) , the cerebellums of the more active rats

A) contained more neuronal connections and dendrites.
B) contained fewer neuronal connections but more axons and dendrites.
C) were less likely to possess pathological neurotransmitter circuits.
D) were exactly the same as the inactive rats.