An adjective is a word that tells about a noun. It answers the questions what kind or how many.
Is that a green chair? (what kind)
I only asked a few questions. (how many)
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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.