Your answer is A. Hope I helped.
The correct answer is c. a person who has lost a job but is looking for one
The labor force is the sum of all employed and unemployed people who are of legal age and have or don't have full time jobs. That rules out B, while D is not a part of the force because a mother is not unemployed by force, but rather because she chooses not to join it. A job as an Army Sergeant is not a part of the labor force because it is not technically labor.
