Answer: A.J. joined a group that studies phrenology.
Step-by-step explanation:
Pseudoscience can be define as the statement, practices or beliefs that are claimed to be scientific but they are not as they are not supported by the experimental trials.
Phrenology is a pseudoscience. It deals with the study of the skull conformation that can be responsible for mental faculties and traits in the character of the human being. It is pseudoscience as it is based on assumption and not on experiment based approach.
On the basis of the above description, A.J. joined a group that studies phrenology. is the correct option.