How Has the Study of the Mind Changed Across Psychology's

How has the study of the mind changed across psychology's history?

A) Psychologists have largely abandoned the study of the mind in favour of the examination of objective behaviour.
B) Psychologists have found increasingly direct ways to study the mind.
C) Psychologists have only very recently started to study the mind along with behaviour.
D) To eliminate biases, psychologists have increasingly relied on indirect methods of studying the mind.