Which of the Following Is True of Shared Intentionality and Collaborative

Which of the following is true of shared intentionality and collaborative activities in children?

A) Collaborative activities decrease during the second year of life as toddlers become more adept at communication.
B) Children begin to collaborate with caregivers in joint activities between 9 and 12 months of age.
C) Children who show the tendency to share tend to help and comfort others.
D) The motivation to help and share and the ability to understand others' intentions develop between 3 and 4 years of age.