A social worker at a community agency wants to determine if a new 10-week job skills training program is effective. Due to logistical and ethical constraints, the social worker cannot randomly assign participants to the program or a control group. Which research design is MOST appropriate for evaluating the program's effectiveness under these circumstances?
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A
True experimental design
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B
Qualitative case study
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C
Quasi-experimental design
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D
Single-subject design