Choose the correct combination for the labelling in the diagram from the given option.

• A. A = Endoderm
• B. A = Mesoderm B = Mesoderm B = Endoderm C = Ectoderm C = Ectoderm
• C. A = Mesoderm
• D. A = Endoderm B = Ectoderm B = Ectoderm C = Endoderm C = Mesoderm
• E. Bufo