Answer: a) Neonate
Step-by-step explanation:
Neonate is the infant who has been newborn and is less than of four weeks.After a month they are not considered neonate.
According to the question, neonate is described from description as Marcia is a new born infant who is less than of about 28 days .She has amniotic fluids, cheese like substance on body , velvet like like air etc features of newborn.
Other option are incorrect because baby, fetus and infant is not described through the description in the question.Thus, the correct option is option(a).