The correct option is B Natural number
Set of whole numbers ={0, 1, 2, 3, 4,...}
Let's find out the sum of two distinct whole numbers.
For example: 0+1=1,0+2=2,1+2=3,
where the sums of two distinct whole numbers produce 1, 2 and 3, which are natural numbers.
Hence, we can conclude that the sum of two distinct whole numbers is always a natural number.
∴ Option (b.) is the correct choice.
Notes:––––––––
∙ The sum of non-distinct whole numbers may or may not belong to the set of natural numbers.
As an example, 0+0=0, which does not belong to the set of natural numbers. Whereas 5+5=10 belong to the set of natural numbers.
∙∙ The sum of distinct or non-distinct whole numbers belongs to the set of whole numbers always.