The correct answer is B. Moscow
Step-by-step explanation
Moscow, St. Peterburg, Kyiv and Minsk are cities located in the Eastern European region. Moscow is the capital city of Russia, it is a city with a population of around twelve million five hundred inhabitants; St. Petersburg is a main city of Russia and its population is approximately five million three hundred inhabitants; Kyiv is the capital city of Ukraine and its population is about three million inhabitants; Minsk is finally the capital city of Belarus and its population reaches two million people. According to the above, the city with the highest number of settlers in Moscow. So, the correct answer is B. Moscow.