Babies Born to Mothers Pregnant During the 1998 Ice Storm

Babies born to mothers pregnant during the 1998 ice storm, that plunged much of Quebec and Eastern Ontario into cold and darkness, had babies who tended to speak less at two years of age. This is most likely because

A) mothers provided less in utero linguistic input than they normally would.
B) baby's day/night cycles were disrupted at a critical time in fetal development.
C) the drop in temperature occurred at a critical time in fetal development.
D) high levels of maternal stress hormones directly affected fetal development.