The Same Households Do Not Necessarily Remain Rich or Poor

The same households do not necessarily remain rich or poor over time because:​

A) the normal life cycle pattern of income changes over time.
B) the productivity of workers vary with on-the-job training.
C) an economy experiences fluctuations in the level of economic activities.
D) an economy experiences changes in inflation rates over time.
E) technological changes influence the income earned by workers.