Question $3(1$ point$)$

After it was all over, Susan Jones surveyed the $150$ residents of her neighborhood about their reactions to a three$-$week experimental trash collection program. In the program, residents separated cans, paper, glass, and plastic for recycling. She also examined the percent of trash in the neighborhood that was properly sorted at the end of the three$-$week period. Her results were used to prepare a report for the city trash collection department. Given that Susan was evaluating the trash collection program, her study is an example of:

Descriptive research

Exploratory research

Explanatory research

Applied research