Final answer:
A person working part-time but seeking full-time employment is 'employed and in the labor force.' This situation falls under 'hidden unemployment,' a term also applicable to individuals who are underemployed. The correct answer is option a.
Step-by-step explanation:
A person working part-time who wants to work full-time is considered employed and in the labor force. This is because they currently have employment, even if it's not to the extent or nature they desire. The term 'hidden unemployment' is often used to describe this scenario along with the situation of individuals who may be underemployed, working in a lower paying job or one that doesn't fully utilize their skills. The labor force consists of those who are employed and those who are unemployed, the latter being individuals who are without a job and are actively looking for one. Therefore, the correct option for the situation described is 'a. employed and in the labor force'.