Answer:
I know it isn't C or D, but A makes more sense than B. I do not have this specific assignment, so I do not know for certain, but this seems the most logical answer. I wish you the best of luck.
Explanation:
The Sabatier effect is produced by re-exposing a photographic material to light part way through the development process. This gives the resultant image both positive and negative qualities. It is sometimes incorrectly referred to as “solarisation”.