Showing data

This task is about the best type of graph to show different data.
a)  Sivendra threw a dice 50 times.
     After each throw they wrote the number facing up.

dice

What kind of graph would be best to display this data?
 
  (A)
(B)
(C)
(D
Bar graph
Line graph
Box-and-whisker graph
Stem-and-leaf graph
 
 
Ahika
 
b)  Ahika chose a histogram to graph the heights of people in his class.
     Why is a histogram the best kind of graph to display this type of data?