Relative adverbs are used to join sentences and clauses.
This is the school where I did my high schooling.
Also, we know that relative pronouns function as the subject or object of the verb in the additional clause and refer to the person, place, or thing being talked about or done something to.
She is the girl who painted that mural.
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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.