Dot plots are provided which display some students' scores after taking two rounds of a quiz. What is an accurate inference you can make using the dot plots? (3 points)

a
Round 1 scores were higher than round 2 scores.

b
Round 2's data has a greater range than round 1.

c
There is no overlap between the data.

d
Round 2 scores were lower than round 1 scores.