PART 2 - USE OF ENGLISH - Choose the best option to complete the following question

Explanation:

• Break down = to stop functioning or to collapse emotionally or structurally. (sụp đổ , trì trệ, đình trệ)
  In this context, it means that life can stop functioning properly or become difficult due to urban problems.

Other options do not fit:

• Break up – to end a relationship or event ( chia tay)
• Break in – to enter by force, usually illegally ( đột nhập)
• Break through – to make a sudden advance (especially in overcoming an obstacle) ( đột phá, vượt qua trở ngại)