Step 1: Understanding the Concept:
Sustainability, particularly in human development, means fulfilling present needs without hindering future generations' ability to meet their own. This is inter-generational equity.
Step 2: Detailed Explanation:
- (A) Continuity in the availability of opportunities: This is a fundamental principle of sustainability, ensuring current opportunities for a good life are not diminished for future generations. This statement is correct.
- (B) Each future generation must have higher opportunities (At least double)...: This is a misinterpretation. Sustainability requires non-declining opportunities, not a specific growth rate like doubling. It means maintaining at least the same level. This statement is incorrect.
- (C) All environmental, financial and human resources must be used keeping in mind the future: This accurately reflects sustainable resource management, implying current use should not deplete future capital. This statement is correct.
- (D) Each generation must ensure the availability of choices and opportunities to its future generations: This is another phrasing of inter-generational equity, similar to (A), and is central to sustainability. This statement is correct.
Step 3: Final Answer:
Statements (A), (C), and (D) correctly represent sustainability.