I would say the correct answer is that has an undetermined answer.
If a subject has been thoroughly covered, then there is no need for this researcher to do it all over again. If it's impossible to answer, there is no need to try. If it can be answered easily, then it doesn't really require a research. This leaves us with the last option, because a researcher might want to try and determine the answer.
Labourer is the synonym of the given problem.
Synonym:
It is one of two or more words or expressions of the same language that have the same or nearly the same meaning in some or all senses.
Labourer:
A laborer (or labourer) is a person who works in manual labor types, especially in the construction and factory industries' workforce. Laborers are in a class of wage-earners in which their only possession of significant material value is their labor.
They are the basic pillar in the country development and have a huge impact over the economy of the nation.
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Yes, in their history they have had racist character stereotypes.
