Final answer:
The richest 20 percent of all people earn about 77 percent of the entire world's income. Option d.
Step-by-step explanation:
The answer to the question is d. 77 percent.
According to the provided sources, the richest 20 percent of all people in the world earn about 77 percent of the entire world's income. This means that a small portion of the global population has a significant share of the world's income.
For example, in the United States, the wealthiest one percent of the population holds one-third of the nation's wealth, while the bottom 50 percent holds only 2 percent. This level of income inequality is not unique to the United States but is reflected on a global scale.
So Option d is correct.