You are a subject in an experiment and you are told: "look at this apple very carefully and tell me your exact sensations and feelings as you experience them." the experimenter in this study probably believes in what school of psychology?

There are a lot of schools of thought under psychology - structuralism, functionalism, behaviorism, psychoanalysis, humanism and cognitive psychology. When the experimenter asks of your exact sensations and feelings as you experience them is more on introspection, the major component of structuralism.