Research has been conducted on Adler's ideas about

A) dreams.
B) social interest.
C) birth order.
D) all of the answers

Birth Order

The chronological order of sibling births in a family, which is believed to influence personality and behavior.

Social Interest

A concept introduced by Alfred Adler, referring to an individual's attitude towards and awareness of being a part of the human community and showing concern for the welfare of others.

Dreams

A series of thoughts, images, and sensations occurring in a person's mind during sleep.