<em>Summarising is an important skill in academic writing. It enables you to extract the most important points from a text and rewrite them in your own words, in a shortened form. ... Being able to write a good summary also demonstrates that you have fully understood the text you are reading.</em>
The correct answer should be C) bar graph.
You could make a bar graph with two bars, one representing losses and one representing wins, and then put the same pair of bars next to each other and observe how the trends changed as years went by. The others would be very odd for using the data available and would probably not be used.
Can you be more specific?