Answer:
Option C,
Repression is an involuntary process of forgetting and we can’t remember even if we try.
Suppression is a voluntary process of forgetting and we can remember when asked.
Step-by-step explanation:
Suppression is a voluntary act of forgetting some fact, memories, feelings, thoughts and impulses. When a person is asked about any such thing, he/she would not prefer to tell about it even though they remember it at the time of question being asked.
While repression is an involuntary act of forgetting some fact, memories, feelings, thoughts and impulses. For example - if someone is asked about their childhood bad memories, they might not be able to recollect it.
Hence, option C is correct.