The words “a, an, and the” are articles. They come at the beginning of a noun phrase.
A and an are used when talking about something unspecific. Use a before words starting with consonant sound. Use an before words starting with vowel sound.
I want a pen. [any pen]
I have an umbrella. [any umbrella]
The is used when talking about something specific.
Have you washed the car? [specific car]
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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.