Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22

Living in a big city in Vietnam can be exciting, but it often comes with higher costs. ___(1)___. Many items, from food to housing, are priced significantly higher than in smaller towns. This increase can make it tough for students and young workers to manage their budgets, especially when they are just starting out.
One reason for these higher costs is that big cities attract people from all over the country, ___(2)___. With more people moving to cities for job opportunities, there is a constant push for better housing, schools, and entertainment. As a result, businesses often raise their prices to meet this demand, making everything from groceries to rent more expensive. ___(3)___.
Additionally, services like transportation and healthcare are often more costly in cities. Basic needs ___(4)___. For many, these extra expenses can lead to financial stress, especially for those who are new to city life. By understanding these factors, ___(5)___.