Can someone please help me this is social studies

Which of these describes the most important popular jobs in the new england colonies

Why do governments supply public goods and services instead of selling them to those people who use them

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?