The unemployment rate might underestimate the underutilization of labor resources because it does not include? ______.
A) people who are without work and have made specific efforts to find a job within the previous four weeks
B) marginally attached workers and? part-time workers who want? full-time jobs
C) people who are waiting to be called back to a job from which they have been laid off
D) people who are waiting to start a new job within 30 days