The question mark ends a sentence that asks something. It shows that a sentence is a question. Since question marks can be used in a variety of ways, they have a few rules you must memorize.
In the given sentence, the following rule is used:
If a question has an abbreviation at its end, include a question mark after the period.
Are they going to Washington D.C.?
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.