What is the cause of fetal alcohol syndrome

a alcohol in the pregnant woman's bloodstream contracts her blood vessels and prevents her from providing the fetus with adequate nutrition

b alcohol in the pregnant woman's bloodstream crosses the placenta into the unborn fetuses system and disrupt its ability to get enough oxygen for normal growth and development

c alcohol in the pregnant woman's bloodstream makes her reckless and more likely to fall or otherwise cause injury to the fetus

d alcohol in the pregnant woman's bloodstream makes her irritable and irrational and her bad temper affects the fetuses development