Answer
Washing your hands is the most common approach and is chosen by $61\%$ of the whole population.
Work Step by Step
Since angles are often hard to compare by naked eyes, the pie chart is often not useful in comparing one category of data over the other.
However, in this case, it is quite obvious that the 'washing your hands' part takes over the largest portion of the whole pie chart, and thus, is the most common approach, according to people, to beat the flu.
Also, by looking at the percentage under the text 'Washing your hands' in the pie chart, we see that $61\%$ of the population chooses this method.
