Choose which ancillary or supportive criterion is addressed in each of the following statements about sudden infant "infants who are always put to bed on their bellies (prone) have an increased incidence of sids compared to those who are put to bed prone less than half the time. babies that are put to bed prone less than 50% of the time have an increased incidence of sids compared to those who are never put to bed prone." consistency "the relative risk or odds ratio for sudden infant death syndrome (sids) and infants that sleep on their bellies is approximately 6." biological plausibility "the mechanism that predisposes some infants to sids is unknown but active research is beginning to identify predisposing factors related to brain development." strength of the association putting babies to sleep on their bellies is associated with increased risk of sids in the united states and europe, as well as in developing countries. dose-response relationship