Julia is a veterinary technician. What type of graph would be most suitable for comparing graduate numbers?

A bar graph is the most suitable choice for comparing graduate numbers because it effectively displays categorical data and allows for easy visual comparison between different groups. Each bar represents a distinct category, in this case, different years or different graduation programs, and the height or length of the bar reflects the number of graduates in each category. This makes it straightforward to see which category has the highest or lowest number of graduates.

While a pie chart could show proportions of graduates within a whole, it is less effective for comparison since it does not represent a scale of differences clearly, especially when categories are close in size. A histogram, on the other hand, is used to represent the distribution of numerical data rather than categorical comparisons. A line graph is typically best for showing trends over time rather than discrete comparisons between groups, which makes it less applicable in this context.