Multiple Choice, Single Answer

Sample

Many cities are investing in public transport to reduce traffic congestion and pollution. Efficient systems such as metro trains and electric buses not only save time but also lower carbon emissions. However, these projects require significant funding and long-term planning.

Question: What is the main idea of the passage?

A. Public transport is too expensive for cities
B. Cities are improving transport to solve major urban problems
C. Electric buses are better than metro trains
D. Traffic congestion cannot be reduced

Answer: B