Moderate

High correlation with premature birth has been found in cases where the mother's behavior included _____________?

Correct answer: C. smoking

  • A. depression
  • B. exposure to radiation
  • C. smoking
  • D. alcoholic beverages

Explanation

Maternal smoking is strongly associated with premature birth because nicotine and carbon monoxide reduce oxygen and impair placental functioning. Depression can affect pregnancy, but smoking is the established risk factor among these options.

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