To be honest I think it is B. Static Stretch is used to stretch muscles when the body is at rest.
A is the answer because the community wants ALL of its citizens to become more physically active and by purchasing a bicycle for each household it can work so everyone in that household will get a chance to ride the bicycle.
So the enzymes in your stomach are most likely there to help you disguest your food. Also they make sure everything is good in your stomach.
The answer to this question is d. measure the electrical output of the brain! Good Luck!