Why Do People on Fixed Pensions Get Poorer Every Year

Why do people on fixed pensions get poorer every year?

A) because payments remain stable, but inflation reduces their real value
B) because payments are fixed on life expectancy, and the longer the retiree lives, the less the pension pays out
C) because payments depend on the number of wage earners paying in, which is decreasing, and the number drawing pensions, which is increasing, as society ages
D) because payments do not fluctuate with OAS payments