The following example shows that the one which has an error of addition by one is 3261 + 6513 = 9874. Hence, Opinion D is correct.
What is addition?
One of the four basic operations of arithmetic is addition. Apart from that, other operations are subtraction, multiplication, and division. In addition, two or more numbers are added.
In other words, the addition of two whole numbers results in the total amount or sum of those values combined. For denoting the addition, the sign which is used is '+'. When there is a list of numbers, it is easy to write them in a column and perform the calculation at the bottom.
Therefore, Option D is correct.
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