Signals from the parasympathetic nervous system cause which of the following a rise in blood pressure b increase in pulse rate c rise in metabolic rate d rise in blood sugar level?

The parasympathetic nervous system is responsible for rest, relaxation and digestion among other things. This would be why after you eat a meal you feel relaxed and maybe even slightly tired. This is because the parasympathetic nervous system has kicked in to allow more energy to be used by the body for digestion of the food you have just eaten.

The answer to this question is c) a rise in metabolic rate

The sympathetic nervous system is responsible for preparing you for physical activity by increasing heart rate, raise in blood pressure, etc.