Which of the Following Statements Does Not Have a Solid

Multiple Choice

Which of the following statements does not have a solid foundation in brain-based research?

A) Physical exercise can enhance the functioning of the central executive.
B) Mental "relaxation" is usually not needed because it wastes time that could otherwise be spent learning something new.
C) Learning activities that provide intellectual stimulation can foster the growth of new neurons.
D) A good night's sleep can lead to improved memories.