The sympathetic nervous system is to as the parasympathetic nervous system is to a. emergencies; relaxation b. fight; flight c. striated muscles; smooth muscles d. assertiveness; aggressiveness

The correct answer is a. emergencies; relaxation.
The sympathetic nervous system is a part of the autonomous nervous system which is active during the fight or flight reactions (in response to a harmful event, attack, or threat). The parasympathetic nervous system is complementary to sympathetic and it stimulates the body to "feed and breed" and to "rest-and-digest".