Which of the Following Describes a Situation in Which a Country's

Which of the following describes a situation in which a country's unemployment rate might fall even though the number of employed persons has not changed?

A) Some unemployed persons quit looking for work because they are convinced they cannot find a job.
B) Some full-time homemakers decide to start looking for work.
C) The number of new entrants into the labor force is exactly equal to the number of retirees leaving the labor force.
D) The rate at which new entrants into the labor force find jobs drops because firms want to hire more experienced workers.