Freud emphasized that stressful and painful experiences are repressed into the unconscious. But modern research has demonstrated that high stress and associated stress hormones enhance memory.
support for the projection of repressed fears.
support for fixation of repressed sexual desires.
support for the displacement of repressed hostilities.

that high stress and associated stress hormones enhance memory

Explanation:

Sigmund Freud divided the brain of the humans into three parts which are the conscious, subconscious and the unconscious.

The unconscious mind is a part of the mind which is involved in the repression of the painful and stressful conditions. This repression is a type of defence mechanism which is performed by the brain to avoid reality and justify our ego.  

But the modern science experiments proved that stressful and painful experiences are not repressed instead they enhance the painful memory stored in the brain.

Thus, the selected option is correct.

answer; (you have the right of way);