The outer-to-inner sequence of tissue layers in a post-gastrulation vertebrate embryo is

A)endoderm → ectoderm → mesoderm.
B)mesoderm → endoderm → ectoderm.
C)ectoderm → mesoderm → endoderm.
D)ectoderm → endoderm → mesoderm.
E)endoderm → mesoderm → ectoderm.