Trevor Trevor Is Going for a Run. He Starts Thinking About

Trevor
Trevor is going for a run. He starts thinking about all the things that he needs to do throughout his day, and he decides that after he showers he will study for his midterm for a little while before he goes to work for the evening. As Trevor rounds the corner near home, he sees something move near his feet and then feels a sharp pain in his right leg. At this point, Trevor's heart rate increases substantially, as he spins away from the dog that just bit him. As the dog's owner apologizes and puts the dog back on its leash, Trevor's heart rate slows down and he then makes his way home.
-As Trevor is running,what area of his brain is sending signals to his muscles so that they will move

A)  motor cortex in the parietal lobes 
B)  somatosensory cortex in the parietal lobes 
C)  motor cortex in the frontal lobes 
D)  somatosensory cortex in the frontal lobes