The value that is the furthest from 0 on the number line will be D. -21.5.
What is a number line?
It should be noted that a number line simply means a straight line that is used as an abstraction for real numbers.
A number line has an equally spread increments of number. In this case, the value that is the furthest from 0 on the number line will be -21.5.
In conclusion, the correct option is D.
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