The baseline (0 months) BMI distributions for children randomized to the Intervention and Control groups are relatively similar. The most likely explanation for this is:

a. BMI values tend not to vary in children 3 to 5 years old.

b. Parents who chose either to put their child in Intervention group or the Control group had similar children in terms of BMI

c. Subjects (parent/child pairs) were randomized to the Intervention and Control groups.

d. Because this is a not a case-control study design