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If \(k\) and \(y\) are integers, and \(10k + y\) is odd, which of the following must be true?
A. \(k\) is odd
B. \(k\) is even
C. \(y\) is odd
D. \(y\) is even
E. both \(k\) and \(y\) are odd
[spoiler]OA=C[/spoiler]
Source: Manhattan GMAT
A. \(k\) is odd
B. \(k\) is even
C. \(y\) is odd
D. \(y\) is even
E. both \(k\) and \(y\) are odd
[spoiler]OA=C[/spoiler]
Source: Manhattan GMAT
