The dot plots below show the scores for a group of students who took two rounds of a quiz:
Two dot plots are shown one below the other. The title for the dot plot on the top is Round 1 and the title for the bottom plot is Round 2. Below the line for each dot plot is written Score. There are markings from 5 to 9 on the line at intervals of one. There is 1 dot above the mark 5, 4 dots above the mark 6, 2 dots above the mark 7, 2 dots above mark 8, and 1 dot above the mark 9. For the bottom dot plot there are 3 dots above the mark 5, 1 dot above the mark 6, and 6 dots above the mark 7.
Which of the following inferences can be made using the dot plot?
A. There is no overlap between the data.
B. Round 1 scores were lower than round 2 scores.
C. Round 2 scores were higher than round 1 scores.
D. The range of round 1 is greater than the round 2 range.