A typical day in the life of an enslaved African American on a southern plantation would include which of the following?

Select the best answer from the choices provided.
A.
all-day field work
B.
the strict watch of overseers
C.
sleeping in basic cabins
D.
All answers are correct.

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?