Edward titchener was concerned primarily with the discovery of what

Structuralism

Edward Titchener was concerned primarily with creating his version of psychology that described the structure of the mind. He was a follower of the German psychologist Wilhelm Wundt, the founder of experimental psychology. Titchener refined Wundt's theory to make it more systematic  

#2 the answer is d

#3 the answer is a

#4 the answer is b