One of the major reasons nativist's do not like immigrants and want them to keep out (usually) is the fact that many of the immigrants move to find better jobs, which would take job options from those who live in the area. Higher demand for jobs would lead to less openings and higher requirements that people would need to meet to get the job, which spawns a struggle for limited work.
I feel like it can either be A. economic growth that is too rapid or C. increased demands on services and jobs. It depends on the scenario given. I'd choose A but I still feel like it genuinely can be either.
