A battleship graph shows cause and effect relationships. an artifact's pattern of use over time. percentages of a whole. comparisons of different categories.

A battleship graph, also known as a bubble chart, is a type of graph that displays three dimensions of data. Each entity with its triplet (v1, v2, v3) of associated values is plotted as a disk (a 'bubble') in the graph, where the position of the bubble on the horizontal and vertical axis represents v1 and v2, and the size of the bubble represents v3. This type of graph is used to compare different categories of data, where each bubble represents a different category and the size of the bubble represents the value of that category. Therefore, the correct answer is "comparisons of different categories".