In Which of the Following Scenarios Would a Bar Graph

In which of the following scenarios would a bar graph be the best graphic organizer for the data?

A) In a marketing presentation about total units sold by competing brands during the last month
B) In a student's presentation about how represented each eye color is in his class
C) In a city planner's presentation about intra-county migration in relation to construction
D) In a non-profit organization's presentation describing malnutrition as a byproduct of war, using one troubled nation over a period of time as the data source