Answer: A) not in the labor force.
Step-by-step explanation:
Labor force is made up of employed and unemployed members in field of work.People who are not looking for any work and doing no job are not a part of this force.
According to the question a full-time student who is not involved in looking for job and does no working is not a part of labor force.
Other options are incorrect because employed, unemployed in frictional manner, discouraged employee and unemployment is not indicated by a full time student who is not doing any job. Thus, the correct option is option(A).