Click on the Illustrator icon and then ... the bars made in 3D. This is what the graph would look like if the bars and the categories are made in 3D. To make the X and Y axis line remain unchanged ...

3. Click the "Insert" tab at the top of the window, then click on the line graph icon — it looks like two zigzagging lines with data points on them. 4. Select the chart style that you prefer ...