Nothing is clear from the image you uploaded, its not even clear. Kindly, upload a sample file, so that somebody can see what's going wrong. From the image its hard to tell why it is not selecting proper data.
if you can see i have four column Name of the processor, Time, Targer time and utilization.
in the graph I want to prepare the bar graph having different bars for Time, Target and Utilization but when I select the data and try to prepare the Bar chart the bar is showing only for Utilization.
Well I actually don't know the exact reason behind it, but it is treating first 3 columns as X values. If you delete Processor i.e. B3 and select data , you will get it.