Identifying Relative Pronouns
A relative pronoun introduces a relative (or dependent) clause in the sentence. The five main relative pronouns are who, whom, whose, which, and that.
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.