A researcher found the following correlation between birth weight and maternal cigarette consumption: r = -.678. The best interpretation of this statistic is which of the following? A. There is a negative, moderate relationship between maternal cigarette consumption and birth weight B. Low birth weight causes an increase in smoking C. There is a direct, positive relationship between smoking and birth weight D. There is a direct causal relationship between smoking and birth weight; as smoking increases, it causes an increase in birth weight