Final answer:
Human trafficking indicators include seizure of passport and lack of legal documentation.
Step-by-step explanation:
The scenario described with Maria and other Filipino nationals showcases clear indicators of human trafficking. One of the most evident signs is the seizure of passport, which is often used by traffickers to prevent victims from leaving and asserting control over them. The promised support and well-paying jobs were not provided, which is a deceptive practice used to lure victims into trafficking situations. Additionally, the charging of recruitment fees with no actual employment secured is another indicator of the exploitation that is characteristic of human trafficking operations.