9 A 2018 article in JAMA reports the results of a randomized trial designed to (as per the authors): "test the effect of a multicomponent behavioral intervention on child body mass index (BMI, calculated as weight in kilograms divided by height in meters squared) growth trajectories over 36 months among preschool-age children at risk for obesity." The following graphic shows boxplots of the BMI distributions for both the Intervention (n=298 children) and Control (n=302 children) groups at the time of randomization (0 months), and at specific time points in the follow-up period: Figure 2. Child BMI by Group at Each Follow-up Time Point 30- Intervention Control 25 Observed Child Body Mass Index 20 15 10 0 3 9 12 24 36 Time, mo Most likely, why are the BMI distributions similar in terms of center, shape and variability at the time of randomization (0 months)? a. All children have very similar BMIs at birth. b. The number of children in each of the two groups is almost the same. c. Each child in the Intervention group was matched with a specific child in the Control group who had the same BMI. d. Children were randomized to the intervention and control groups