Which of the Following Is True Regarding the Development of Role-Taking

Which of the following is true regarding the development of role-taking skills?

A) It is not until at least age 20 that people are able to include a mental perspective of some "generalized other."
B) By age four years, most children understand that parents may not think the way they do.
C) Concrete-operational thinkers are capable of simultaneously considering several different points of view.
D) The ability to consider a situation from a number of different points of view increases the quality of one's social relationships.