Which of these options would decrease the data-ink ratio of this chart? This bar chart shows Satisfaction Score by Group. The groups are numbered 1 through 7 at the x axis, with numbers on the y axis ranging from 0 to 90. The bars are in a light blue and the background is white. a. Eliminating the chart title b. Changing the hue of the bars c. Adding gridlines d. Removing the column labels