Concept:Human trafficking is the illegal trade of human beings for the purpose of exploitation.
Explanation:Human trafficking involves the recruitment, transportation, or harbouring of persons by force, fraud, or deception.
Traffickers control victims in order to exploit them for profit.
The most common form of this exploitation is forced labour, where victims are made to work against their will.
Victims may also be subjected to sexual exploitation, slavery, or practices similar to slavery.
They usually work under threats, violence, coercion, or debt bondage and receive little or no pay.
Visiting tourist sites, part-time studies, or lucrative employment are voluntary or lawful activities.
These options do not match the coercive and dehumanising conditions experienced by trafficking victims.
Therefore, the correct answer is forced labour.
Answer:C. forced labour