If 'a' and 'b' are whole numbers, then what is\[\text{a - b}\]?

1.	If 'a' and 'b' are whole numbers, then what is\[\text{a - b}\]?
A.	A whole number.
B.	A natural number.
C.	Cannot be determined.
D.	Subtraction is not possible.
Answer» D. Subtraction is not possible.

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