"a colleague in the office wants to use an appropriate graph for contrasting two pieces of data to see if they are related by causality. select which type of graph he should use" options to select: bar chart - column chart, line graph, pie chart or scatter graph which chart is best suited?

Line Graph

Step-by-step explanation:

A line graph is commonly used to display change over time as a series of data points connected by straight line segments on two axes. The line graph therefore helps to determine the relationship between two sets of values, with one data set always being dependent on the other set.

Line graphs are drawn so that the independent data are on the horizontal a-axis (e.g. time) and the dependent data are on the vertical y-axis. Line graphs are used to track changes over short and long periods of time. There is some debate about the degree of measurement between time points