While awaiting the birth of a new baby, North American parents typically furnish a room as the infant’s sleeping quarters. For decades, child-rearing advice from experts has (A) (encouraged / been encouraged) the nighttime separation of baby from parent. For example, a study recommends that babies be moved into their own room by three months of age. “By six months a child (B) (who / whom) regularly sleeps in her parents’ room is likely to become dependent on this arrangement,” reports the study. Yet parent-infant ‘co-sleeping’ is the norm for approximately 90 percent of the world’s population. Cultures as (C) (diverse / diversely) as the Japanese, the Guatemalan Maya, and the Inuit of Northwestern Canada practice it.

① encouraged …… who …… diverse 

② encouraged …… whom …… diversely 

③ encouraged …… who …… diversely 

④ been encouraged …… who …… diverse 

⑤ been encouraged …… whom …… diverse