Which is true with respect to Kurt Lewin's contributions?

A) He was much more interested in social problems than practical issues.
B) He emphasized the role of theory in applied work.
C) His biggest contributions were made in the 1990s.
D) all of these

An impairment of language is known as

A) linguistic determinism.
B) telegraphic speech.
C) babbling.
D) aphasia.