Correct Option (D)
All three statements provided are accurate standard unit conversions.
- Statement 1: The conversion 1000 litres = 1 m³ is correct. One cubic meter is precisely equivalent to 1000 liters, representing a standard unit of volume in the metric system.
- Statement 2: The definition 1 metric ton = 1000 kg is correct. A metric ton, also known as a tonne, is a unit of mass equal to 1000 kilograms.
- Statement 3: The conversion 1 hectare = 10000 m² is correct. A hectare is a unit of area commonly used for land measurement, defined as 10,000 square meters.
Since all three statements are factually correct, the option encompassing all of them is the appropriate choice.
Incorrect Options:
Options (A), (B), and (C) are incorrect because they selectively exclude one or more statements that are factually accurate. As established, statements 1, 2, and 3 are all correct standard unit conversions.