<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:During the third week of development, the blastula undergoes a variety of differentiation processes responsible for the formation of the gastrula and, eventually, the embryo. This differentiation creates cell lineages that eventually become a variety of body systems. What cell lineage, present at this date, is responsible for the formation of the liver?? A: Syncytiotrophoblasts, B: Endoderm, C: Ectoderm, D: Mesoderm, E: Neuroectoderm,  <response>: This question is asking about the embryonic development of the liver during the third week of development when the blastula differentiates into the gastrula and eventually the embryo. The key point is identifying which embryonic cell lineage is responsible for forming the liver. The liver arises from the endoderm germ layer, so the correct answer should be the cell lineage that forms the endoderm.B: Endoderm 