Step 1: Understand eidetic reduction.
In Husserlian phenomenology, eidetic reduction aims at grasping the essences (eidos) of phenomena by bracketing empirical contingencies.
Step 2: Identify the target of eidetic analysis.
This method seeks invariant and necessary structures underlying experiences, not accidental or merely subjective features.
Step 3: Eliminate incorrect options.
(B) refers to contingent features, not essences.
(C) describes phenomenological description in general, not eidetic reduction specifically.
(D) pertains more directly to transcendental reduction, not eidetic reduction.
Step 4: Conclusion.
Therefore, eidetic reduction provides access to the essential structures of pure psychic processes.