The Concept of Maternal Instinct

The concept of maternal instinct

A) has become more well-accepted over the past 50 years.
B) is defined by the presence or absence of children-women who do not have children do not have the releasing factors to activate maternal instinct.
C) holds that nurturing behaviors of mothers are biologically defined and largely insensitive to environmental circumstances.
D) both a and b
E) all of the above