The capacity of an object is, the amount that the object can hold.
For example: Consider this water bottle.
Also, consider these measurements:
(a) 20 fluid ounces (b) 10 gallons
Out of these, let's see which one is the better estimate of the capacity of this bottle.
20 fluid ounces is the better estimate for the capacity of the bottle.
10 gallons is a very big quantity.
So, the better estimation is 20 fluid ounces.
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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.