Shale GasĀ is becoming more and more popular in todayā€

Shale GasĀ is becoming more and more popular in todayā€™s Global Gas Exploration Market. Which among the following property of Shale Gas makes it a potential replacement to the conventional Natural gas?

[A] Its distinct Chemical Property which makes it less polluting
[B] Its distinct physical property which makes it easy to store & handle
[C] Itā€™s cost effective production comparing to the conventional Gas
[D] Itā€™s availability in huge Reserves

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