Which of the following is an economic factor that contributes to the stability of a society?

a. fluctuating prices

b. low tax and interest rates

c. strong sense of duty

d. strong military

C) and d) are not economic factors but other kinds of factors: so we can exclude them right away.

among a) and b), a) would actually have a negative influence (lack of security) but b) - the correct answer - would contribute to the stability of a society