A should be labeled as being Bryophytes. I hope this helps anyone who needs to know this.
The light side of the eggs contains yolk in the vegetal cytoplasm. The upper half divides more fastly and is known as an animal hemisphere of the cell. The presence of yolk on the lower side allows space for the upper portion, for the movements of the embryo.
The correct answer is D. The sloth gains nor loses anything from this interaction yet the insects have a nice place to hatch their young.