You have the folowing data sets for the itmes sold:
O{1.0. 5, 1}
O {0.99, 5.01. 5.25 6.79 6.99 7.50 7.51}
O {0.75 2.50. 7.50 7.50 7.50 7.50 10.00}
O {2.50 2.51 5.00 5.01 7.50 7.51 10.00}
In a Histogram the data is grouped on diferent intervals
In this case, you have that the only interval without items sold is the interval [2.51 , 5.00].
Then, you select the data set that contain points in the previous interval [2.51 , 5.00]. The fourth data set contain the 2.51 point and 5.00 point, which belong to the interval withou items sold.
Then, the answer is:
O {2.50 2.51 5.00 5.01 7.50 7.51 10.00}