During which stage of prenatal development would the developing organism be most vulnerable to the effects of a toxin or other environmental influence

A)  fetal stage
B)  embryonic stage 
C)  germinal stage
D)  last two months

Toxin

A poisonous substance produced within living cells or organisms; can be harmful or fatal if absorbed by the body.

Prenatal Development

The stage of human development that occurs from conception until birth, encompassing physical, cognitive, and emotional changes in the embryo and fetus.

Embryonic Stage

The period in prenatal development from about 2 to 8 weeks after conception, where major organs and structures begin to develop.