In September 2014, the Labor Force Participation Rate Fell from 62.8

In September 2014, the labor force participation rate fell from 62.8 percent to 62.7 percent. This change could have been caused by

A) unemployed workers giving up looking for a job.
B) full-time workers becoming part-time workers.
C) unemployed workers getting full-time jobs.
D) discouraged workers starting to look for jobs again.