A newborn's assessment reveals spina bifida occulta. Which maternal factor should the practical nurse (PN) identify as having the greatest impact on the development of this newborn complication?

A. Folic acid deficiency is the most significant maternal factor associated with the development of spina bifida occulta. Adequate folic acid intake before and during pregnancy is crucial for preventing neural tube defects. B. Preeclampsia is a serious pregnancy complication but does not have a direct link to spina bifida occulta compared to the impact of folic acid deficiency. C. A short interval between pregnancies is associated with other risks but is not a known direct cause of spina bifida occulta. D. Tobacco use has various adverse effects on pregnancy and fetal development but is not as directly linked to the risk of spina bifida occulta as folic acid deficiency.