B Development follows a pattern (sit before creep, creep before walk) but varies in normal children. Eleven months is not developmentally slow, but children normally do walk before 2 years of age.
D Cognitive refers to intellectual aspects. It is strongly influenced by environment and is more than just physical development of the brain. Piaget theorized stages a child goes through in organizing knowledge and adapting to the environment.
A Meeting the crying baby's needs fosters trust; it does not "spoil" a child. Crying inconsolably is not a positive outcome for a baby when he fails to have his needs met.