In an Effort to Teach the Derivatives of Each Germ

In an effort to teach the derivatives of each germ layer,you have members of your study group pair adult structures,embryonic germ layers,and,where appropriate,genes involved or sequence information.Which group below has provided the most accurate answer?

A) Adult brain and epithelial tissue are derived from endoderm,which is formed much later than mesoderm.
B) Adult lungs,liver,and pancreas are derived from ectoderm,which forms after the mesoderm.
C) Adult gut is initially formed by the archenteron,the lining of which becomes ectoderm that forms after mesoderm.
D) Adult muscle and bone are derived from mesoderm,which is formed later than ectoderm.