A complete sentence always has a subject and a predicate.
The subject is who or what the sentence is about.
The simple subject is just the noun or pronoun by itself without any other words that modify it or tell more about it.
The old brown dog was barking loudly.
In the above sentence, the simple subject is just the noun “dog.” It tells who was barking loudly.
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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.