Comprehension Passage

Read the following passage and answer questions 

Energy is vital for the functioning of our daily lives and industries. It is derived from various sources, broadly categorized into renewable and non-renewable sources. Non-renewable sources include fossil fuels like coal, oil, and natural gas. These fuels are formed over millions of years from organic remains buried deep within the Earth's crust. While they provide significant energy, their extraction and combustion contribute to environmental pollution and climate change.

On the other hand, renewable sources of energy are naturally replenished and sustainable over time. Solar energy harnesses the sun's radiation through solar panels, converting it into electricity. Wind energy utilizes turbines to capture the kinetic energy of wind, generating power. Hydropower harnesses the gravitational force of flowing water to generate electricity through dams and turbines. Biomass energy utilizes organic materials such as wood and agricultural residues to produce heat and electricity.

What is one of the main challenges associated with using CNG as a fuel?

1
High production cost
2
Limited availability of CNG refueling stations
3
High emissions of nitrogen oxides
4
 Low energy efficiency

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