Cattell Was an Instrumental Figure in Establishing the Boundaries of the New

Cattell was an instrumental figure in establishing the boundaries of the new science of Psychology.He did so by

A) publishing a controversial yet influential textbook on the advantages of mental testing.
B) arguing that Psychology's relationship with the medical field needed to be grounded on their similarities instead of their differences.
C) founding the first laboratory of psychology in the United States.
D) stating that Psychology was scientific because it was built on a foundation of experiment and measurement, much like the physical sciences.