As to Paganis study, it can be inferred that______.
A.
Pagani's 12-year longitudinal study on 163 kindergartners has been ended
B.
the impulsivity scale has positive correlation with the likelihood of children's gambling
C.
the questionnaire is about students' inattentiveness, scores, distractibility and hyperactivity
D.
it is expected in the study that some kids were involved in gambling