Which of the following explanations below is accurate and appropriate? a. Episodes of morning sickness can create a disturbance in maternal metabolism that may interfere with embryonic development. b....

Which of the following explanations below is accurate and appropriate?

a. Episodes of morning sickness can create a disturbance in maternal metabolism that may interfere with embryonic development.

b. Drugs used to treat morning sickness can cause a variety of birth defects.

c. These physical characteristics are highly suggestive of some type of chromosome abnormality.

d. These phenotypic aberrations are pathognomonic (i.e., diagnostic) for Down syndrome.