If k and y are integers, and 10k + y is odd, which of the following must be true? Choose the correct choice from the following answers:
A) k is odd B) k is even C) y is odd D) y is even E) both k and y are odd
10k will be always even as 10 has 2 as one of its factors   if 10k+y is odd, then the only possible explanation is that y is odd   correct answer y is odd
<result>C</result>
If k and y are integers, and 10k + y is odd, which of the following must be true?