Answer:
A. caste
Step-by-step explanation:
The caste system is a model of organization of society into class divisions based on religious precepts.
In this system, the stratification of society occurs according to the birth of the individual in a particular family. The lowest castes belong to the poorest families who suffer from economic problems, social prejudices and a very low prospect of a better future, since this system makes it impossible for individuals to reach larger castes.
In that case, an individual highly motivated to improve his economic and social position would likely be very frustrated in a caste system. Because this system does not allow people in disadvantaged economic and social situations to be able to improve their conditions.