People who oppose labor unions believe that unions

keep more qualified workers from being hired.

create more new jobs than workers can fill.

make many businesses more competitive.

encourage employers to reduce salaries.

People who oppose labor unions believe that unions keep more qualified workers from being hired. The correct option among all the options that are given in the question is the first option. They feel that this decreases the quality of work and increases the amount of time required to finish a job. This factor in turn increases competition for the company.