Without calculating, determine if the following sums are odd or even.  $$25+33-14+525$$ gives an~\uline{~~~~~~~~~~}~number, while $$675-312-13+256$$ gives an~\uline{~~~~~~~~~~}~number． 
选项为:A:odd, even  B:even, odd  C:odd, odd  D:even, even  请回答其中一个选项.