Answer:
a. There are significant differences in incomes between high- and low-income countries.
Step-by-step explanation:
Data provided in the question
Per person GDP in Singapore = $53,591
Per person GDP in Egypt = $5,547
Based on the above information
As we can see that the level of income in Singapore is higher than Egypt also when there is an important difference in the high income and low income countries the same is shown accurately
hence, the correct option is a.