Which of the following is true regarding siblings? a. A gap of 4–8 years between children is common in many cultures across the world. b. “Only children” are maladjusted, meaning they are more prone...

Which of the following is true regarding siblings?

a. A gap of 4–8 years between children is common in many cultures across the world.

b. “Only children” are maladjusted, meaning they are more prone to depression behavior disorders.

c. Jealousy is a common response to the birth of a younger sibling across cultures.

d. Research has shown that young children with older siblings have a more advanced theory of mind than those who are only children.