When 4-Year-Old Juan and 2-Year-Old Carlos, Brothers Who Get Along

When 4-year-old Juan and 2-year-old Carlos, brothers who get along well most of the time, visited the home of their father's coworker for the first time, Carlos did not want to leave their mother's side until Juan took his hand and encouraged him to play ball in the backyard. This episode shows that

A) older siblings are bossy
B) Juan appears to be securely attached to their mother, but Carlos seems to be insecurely attached to her
C) Juan provided a secure base for Carlos, enabling him to explore the new environment
D) Carlos feels emotionally closer to his brother than to their mother