Jackie is running down a trail to prepare for a half-marathon when she notices something that looks like a log in her path. As she gets closer, she sees the log move and realizes it's a large snake. She makes the split decision to veer away from it. Which of the following systems helped Jackie avoid the snake?
A. Parasympathetic nervous system
B. Sympathetic nervous system
C. Somatic nervous system
D. Electrochemical system
Answer: B
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