"dr. stevenson is investigating risk factors such as low income, divorce, single parenthood, and unemployment to assess the challenges they pose to families. dr. stevenson may well use the model in his research."

Family Stress Model

Explanation:

The Family Stress Model is a model that studies how, in families, certain stressors, such as poverty, unemployment, low income, could lead to severe economic pressures that could eventually result in strong parental emotional distress.

These issues are challenges that could eventually have negative long-term consequences in families as they could lead to child trauma, separation, divorce, amongst others.

i think it's b or c hope this

yes peace and development are complementary to each other since they both undergo a great deal of getting where they want to go whether its peace in general and. development