Final answer:
The false statement about the prefrontal cortex is "e. it occupies the posterior portion of the frontal lobe.", as it is actually located in the anterior part of the frontal lobe.
Step-by-step explanation:
The statement among the options provided that is false about the prefrontal cortex is "e. it occupies the posterior portion of the frontal lobe." The prefrontal cortex indeed is a complicated area associated with complex learning (statement a), its development relies on environmental feedback (statement b), it plays a role in the formation of judgment, reasoning, and conscience (statement c), and it is not entirely mature in children (statement d). However, statement e is false because the prefrontal cortex is actually located in the anterior, not posterior, portion of the frontal lobe.