What is the correct answer ? explain

I have the problem written out (in the picture below) but tell me if it is unclear and I will better explain it to you!

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.

She should use 12/3 to measure