Answer:
A - defense mechanisms are intentionally implemented by the ego.
Step-by-step explanation:
A Freudian slip is an error when speaking or in a particular active action (be it physical or otherwise). Therefore, explaining how the unconscious affects us. Maybe we misread or mishear something. For example, if forced to go to a birthday party, maybe we forget our keys and we can't go. On the other hand, a defense mechanism is consciously implemented by the ego, therefore, it's a defense that we actively create.