Count nouns are easy to spot because they are nouns that can be counted. They are a part of a unit or group of more than one.
nurses, schools, knives
Noncount or mass nouns are nouns that cannot be counted. They are a group, a liquid, gas, a concept, an activity, an idea, or a collection.
weather, water, poetry, smoking, milk, money
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.