I would think that the answer is D. all of these, considering that:
1) The cytoplasm is mostly made of water, but also contains salt, enzymes, organelles, and orgaince molecules; 2) The cytoplasm supports and suspends cellular molecules and organelles; and 3) Chemical reactions also occur in the cytoplasm, and the enzymes it contains help speed up these reactions.
The baby needs to take part not only the nipple and the aerola. It needs to be an asimetrical grip, that is, the baby takes a larger portion of the lower part of the aerola than the upper part
