Below are given two statements, one labelled as Assertion (A) and the other as Reason (R). Assertion (A): Biogas has a very high proportion of methane which can be used as fuel for various purposes. Because it does not release smoke or residue, it should be considered a good and safe source of energy. Reason (R): Biogas also contains carbon dioxide. Due to the high proportion of carbon dioxide, biogas gives low energy compared to natural gas. In the context of the above statements, choose the most appropriate answer from the options given below:

Asked in HAS Prelims 2021 · Topic: Non-Conventional Energy (Biomass Energy: Biofuels (bioethanol, biodiesel, biogas) and waste-to-energy)

1. (A) and (R) are both correct, and (R) is the correct explanation of (A).
2. (A) and (R) are both correct, and (R) is not the correct explanation of (A).
3. (A) is correct but (R) is incorrect.
4. (A) is incorrect but (R) is correct.

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