Which New Deal agency was most effective in aiding farmers during the
Depression?
A. The Securities and Exchange Commission
B. The Federal Housing Administration
C. The Social Security Administration
O
D. The Agricultural Adjustment Administration
SUBM

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?