Chart demonstrates smoking's impact on pregnancy outcomes

Steps:

• Review chart data for smoking status and birth weight categories.
• Compare low birth weight rates between smoking and non-smoking groups.
• Note any statistical trends or percentages indicating higher risk.
• Determine the primary inference supported by the visual evidence.

Why B is correct:

• Risk is defined as increased probability of an adverse outcome; the chart shows elevated low birth weight incidence among smokers, directly illustrating this association.

Why the others are wrong:

• A: Chart likely shows fewer women smoke than not, reversing the trend.
• C: Chart focuses on fetal outcomes, not maternal health effects.
• D: Chart indicates smoking as a cause, not low birth weight causing smoking.

Final answer: B