Perner, Ruffman, and Leekam (1994) Investigated the Relationship Between Children's

Perner, Ruffman, and Leekam (1994) investigated the relationship between children's ability to acknowledge false belief and how many siblings they had. They found that:

A) The likelihood of acknowledging false belief is a negative function of the number of siblings a child has
B) Singletons are more likely to pass a test of false belief than children who have brothers and sisters
C) Being able to acknowledge false belief is related to the size of the child's extended family
D) Children's understanding of the mind changes gradually
E) The likelihood of acknowledging false belief is a positive function of the number of siblings a child has