An array is an arrangement of objects in equal rows and equal columns.
Rows go side-to-side. Columns go up-and-down.
This array has 4 rows and 3 columns.
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.