The first quartile Q1 shows a partition of the first 25% of the data. In the same way the quartile Q3 shows a partition of 75% of the data.
Then, the difference Q3-Q1, also called the interquartile range shows the central 50% of the data.
Therefore the answer is option C:
The percentage of Best Actress winners (among women) between Q1 = 28 and Q3 = 41 is 50%.