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The expression 18 - 9 4/9 + 7/9 - 8 can be simplified by first adding the whole numbers, then adding the fractions separately.
To group the expression in a way that makes it easiest to add, we can use option D.
This grouping allows us to simplify the whole numbers first (18 - 9 - 8) and then simplify the fractions separately (-4/9 + 7/9).
So, the correct answer is D.