Henry Is Being Chased by a Large Angry Dog and Manages

Henry is being chased by a large angry dog and manages to jump and scramble up a tall tree. The next day he can't believe that he managed to climb this tree so easily. A biopsychology major he knows correctly suggests that his exceptional performance the previous day was due to the

A) increased flow of blood to the digestive system as the parasympathetic branch of the autonomic nervous system is activated.
B) increased flow of blood to the muscles as the sympathetic branch of the autonomic nervous system is activated.
C) abdomen's dilation and muscle constriction as the parasympathetic branch of the autonomic nervous system is activated.
D) increased flow of blood to the muscles as the parasympathetic branch of the autonomic nervous system is activated.
E) slower heart rate produced as the sympathetic branch of the autonomic nervous system is activated.