The pons is
A) a region of the brain located at the base of the cerebrum and is involved in the regulation of information from other parts of the nervous system
B) a bridge-like structure that provides linkages with the neurons of the two hemispheres of cerebrum, the cerebellum, and the rest of the brain
C) a bundle of white matter that joins the two cerebral hemispheres and is involved in sending messages from one hemisphere to another
D) a part of the brain that controls involuntary responses, such as heart rate and breathing rate