Astudy investigates the effects of a new social welfare program on participants' ability to access housing. the study examines the participants' housing status several times before and after the program was instituted. this is an example of a design.

The correct answer is “simple interrupted time-series”

Explanation:

A time series refers to repetitive observations on a population in a period of time. In an interrupted time series studies is being analyzes the design for evaluating the success of population level health interventions that have been implemented in a certain time. In these studies, a time series is used to set a primary tendency that has been stopped by an intercession in a particular period of time.  

the best answer is b.

hope this : )