The correct option is C - 1 and 3.
[as per provisional answerkey]Why this is correct
Inference 1: The passage explicitly states, "The key source of the battle for clean skies and clear lungs is the fuel we burn." This directly supports the inference that the source of energy is central to the fight for cleaner air. Therefore, Inference 1 is correct.
Inference 3: The passage mentions, "The Supreme Court agreed that fiscal measures were needed to keep clean fuel cheaper than dirty fuel." This confirms that there is judicial approval (Supreme Court) for fiscal intervention (fiscal measures) to ensure benevolent pricing (keeping clean fuel cheaper). Therefore, Inference 3 is correct.
Why the other options are incorrect
- Inference 2 - Bans are effective where the will is strong and people are convinced: This is an incorrect inference because the passage attributes the effectiveness of bans to the availability of alternatives and cost feasibility ("people need alternatives for a ban to be effective"), rather than "willpower" or "public conviction."
- Option (a) - 1 and 2: This is incorrect because Inference 2 is not supported by the passage; the passage focuses on economic and logistical factors rather than social conviction.
- Option (b) - 2 and 3: This is incorrect because it includes Inference 2, which lacks textual evidence regarding "strong will" or "greater good."
- Option (d) - 1 only: This is incorrect because it ignores Inference 3, which is clearly substantiated by the text regarding the Supreme Court's stance on fiscal measures.
Key Concept
Passage-based inference requires identifying specific textual evidence for each claim while avoiding external assumptions about social behavior or political will.