After 20 Years the Boys Are Contacted by a Researcher

Multiple Choice

After 20 years the boys are contacted by a researcher who is conducting a study on twins separated at birth and adopted by different families. John says that he finds it difficult to sustain relationships because he was not provided the support and care that he needed by his adopted mother as an infant. Which theory would best explain John's predicament?​

A) ​Attachment theory
B) ​Behavior theory
C) ​Information-processing theory
D) ​​Nature theory