AMC 8 1990 Problem 4

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Which of the following could not be the units digit [ones digit] of the square of a whole number? $\text{(A)}\ 1 \text{(B)}\ 4 \text{(C)}\ 5 \text{(D)}\ 6 \text{(E)}\ 8$

Dataset text NuminaMath-1.5. Quoted with source.

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