Which is the best display for the set of the number of daily 911 calls made during a month, if you want to be able to identify the mode?

A. Histogram with intervals of 5
B. Histogram with the intervals of 3
C. Line plot
D. Line graph

Please help me I can not and I mean CAN NOT figure this out by myself. So please please please help me ASAP!!!!!!!!!!!!!!!!!!!!