Final answer:
Only about 5% of the CEOs among the top 500 companies worldwide are women, which shows a clear gender gap in leadership positions. Additionally, 21.2% of the 115th United States Congress were women, and around 25% of the countries globally have a unicameral legislature.
Step-by-step explanation:
The percentage of female CEOs among the top 500 companies globally is relatively low. As of current statistics, the correct answer to what percent of the CEOs are women is a) 5%. This reflects the broader issue of gender inequality in the workplace, especially in leadership positions. While there has been progress, the representation of women in high-level roles like CEO positions remains significantly lower compared to their male counterparts.
In terms of representation in government, the 115th Congress of the United States had b) 21.2% of its elected officials who were women. This places the United States at rank twenty-second among the thirty most developed nations in terms of the proportion of women in Congress, indicating room for improvement in female political representation.
Regarding legislative systems, approximately b) 25 percent of countries in the world have a unicameral legislature. This fact is less directly related to the topic of women's representation but provides context for different government structures around the world.