Read the passage and answer the question.

A bus carries as many people as forty cars but occupies far less road space and burns less fuel for each passenger. Cities that invest in public transport see fewer traffic jams and lower pollution. The difficulty is to make buses frequent and reliable enough that people choose them over their own vehicles.

According to the passage, what is the challenge for public transport?

Answer and explanation

Correct answer: B. To make it frequent and reliable

  1. Step 1: The last sentence states the challenge.
Answer
To make it frequent and reliable.
Why not the others: The other options are not mentioned.

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