Answer: d) lies in properly placing the independent variable and the dependent variable.
Step-by-step explanation: Line graphs are the graph that display value of sometime in accordance with the time. The line has two axis names as x-axis on horizontal line and y-axis on vertical line. Independent variables are usually displayed on the x-axis and y-axis has the dependent variable.
The values are needed to be plotted carefully so that the graph obtained is correct. If the placement of independent and dependent value is incorrect, or on incorrect axis leads to incorrect design of graph.