Final answer:
Low blood pressure and constricted pupils signal inactivity of the sympathetic nervous system, which is opposite to the 'fight-or-flight' response where you would see increased heart rate and dilated pupils.
Step-by-step explanation:
Among the options provided, low blood pressure and constricted pupils would signal inactivity of the sympathetic nervous system. The sympathetic nervous system is part of the autonomic nervous system that prepares the body for 'fight-or-flight' during stressful situations. When this system is inactive, we observe a state more compatible with 'rest-and-digest', which is facilitated by the parasympathetic nervous system.
During the 'fight-or-flight' response, the sympathetic nervous system triggers various physiological changes such as increased heart rate, pupil dilation, and increased blood pressure. Conversely, when the sympathetic nervous system is inactive, one would expect to see opposite effects, such as reduced heart rate, constricted pupils, and lower blood pressure. Therefore, option c. low blood pressure and constricted pupils correctly signifies a reduced activity of the sympathetic nervous system.