A Researcher Found a Statistically Significant One Point Difference in Mean

Multiple Choice

A researcher found a statistically significant one point difference in mean ACT scores between students who studied on their own and those who attended a professional test-taking seminar.The researcher can conclude that

A) the means for the groups are statistically different from each other.
B) the professional training seminar produces considerably better ACT scores.
C) professional training is necessary for better ACT scores.
D) None of these is true.