During a psychology lecture on human development, a professor explains that certain cognitive functions develop more slowly in young children compared to adults. This is primarily because:

• A. Children have fewer neurotransmitters than adults.
• B. The synaptic clefts in children are wider than in adults.
• C. The cerebral cortex in children is less wrinkled than in adults.
• D. The neural pathways in children are less myelinated than in adults.

Answer: (D)