For A and B, I feel like these are the best, because for A, I think the picture looks the best because you can see everything. For B, I think the close up is pretty and shows off the flower well.
For C and D, I feel like these are the best, because for C, the picture really looks different because of the exposure. The colors are really skewed and really different as everything is so light. For D, I think the picture looks very nice and expressive, it also has the colors skewed due to the exposure being lighter.
Dark background has the best exposures. Light ones way too light. Needed black and white boards. Also brighter light