A Pregnant Woman Is Exposed to a Teratogen (Something That

A pregnant woman is exposed to a teratogen (something that causes defects in the developing embryo) that inhibits the ability of the epiblast to undergo invagination. Which of the following will occur?

A) Only two tissue layers will form, the epiblast and the hypoblast, and development will arrest with the bilaminar embryo.
B) Only two tissue layers will form, the ectoderm and endoderm, and development will arrest with the bilaminar embryo.
C) Three tissue layers will form, but not from invagination of the epiblast.
D) None of the answer options is correct.