Mirna Is Walking Home from School and Decides to Take

Mirna is walking home from school and decides to take a shortcut across a small park. As she is walking, a large dog comes running towards her, barking loudly. Mirna is terrified and feels her heart beating hard in her chest and her breathing becomes more erratic. The dog's owner comes over quickly and takes the dog away. Luckily, Mirna is not injured. She then goes home and tells the story to her roommate.
-Which part of Mirna's nervous system was activated when she saw the dog

A) Her sympathetic nervous system
B) Her parasympathetic nervous system
C) Her afferent nervous system
D) Her efferent nervous system