A statement tells about something and always ends in a period (.)
I have traveled the whole world.
A question asks us something. It always ends in a question mark (?)
Where is the library?
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.