Final answer:
Belgium is the country with the highest population density among the options, with 916.67 people per square mile. Population density is calculated by dividing the population by the total land area of the country.
Step-by-step explanation:
The country with the highest population density among the given options is Belgium. To determine this, we calculate the population density by dividing the population of each country by its land area in square miles.
- Belgium: 11 million people / 12,000 square miles = 916.67 people per square mile
- Greece: 11 million people / 50,000 square miles = 220 people per square mile
- Zimbabwe: 13 million people / 150,000 square miles = 86.67 people per square mile
- Czech Republic: 10.5 million people / 30,000 square miles = 350 people per square mile
Belgium's 916.67 people per square mile is clearly the highest among these options. It's important to note that while this calculation provides a baseline, real population densities can vary within a country and are often much higher in urban areas compared to rural areas.