Final answer:
The option that is a non-count noun is D) WATER. Non-count nouns can't be counted in individual units and are typically referred to in terms of mass or volume. Examples include water in various quantities, like in a pool or an eye dropper.
Step-by-step explanation:
The non-count noun in the options provided is D) WATER. Non-count nouns, also known as mass nouns, are nouns that cannot be counted because they are typically seen as a whole or mass. They do not have a plural form and cannot be used with the indefinite articles 'a' or 'an'. For example, you cannot have 'waters' or 'a water' in the same way you can have 'apples' or 'a pen'. Instead, you would say 'some water' or 'the water'.
When comparing the provided options: Apples (A) are countable; you can have one apple, two apples, etc. Sand (B) is a non-count noun like water, but it is not one of the choices in the question. Pen (C) is countable as well—pens can be counted individually.
Water (D) represents a substance that is not counted in individual units but rather in terms of volume or mass, making it the correct answer. This is also true regardless of the quantity, as seen with the water in a pool or water in an eye dropper.