Which of the Following Statements MOST Accurately Summarizes Findings from Rosenzweig's

Which of the following statements MOST accurately summarizes findings from Rosenzweig's study of rats raised in different environments?

A) Rats raised individually performed better on learning tasks than those raised with other rats.
B) The brains of rats raised in enriched environments contained more synaptic connections than the brains of rats raised in standard laboratory cages.
C) The environments in which rats were raised had no effect on their performance on learning tasks.
D) The quality of the environment proved to impact female rats' brain development, but not the brain development of male rats.