What Is the Added Worker Effect

What is the added worker effect?

A) A secondary worker enters the labor force when the wage rate is high.
B) A secondary worker enters the labor force when his or her consumption of goods exceeds his or her nonlabor income.
C) A secondary worker enters the labor force when his or her household productivity increases.
D) A secondary worker enters the labor force when he or she no longer must allocate time to household production.
E) A secondary worker enters the labor force when the main worker in the household has lost his or her job or has experienced a wage cut.