关于0是否是INTEGER 问题

KB2016

If n is an integer, is n+1 odd?
(1) n+2 is an even integer.
(2) n−1 is an odd integer.


平均正确率:100%                  

• A Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
• B Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
• C BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
• D EACH statement ALONE is sufficient.
• E Statements (1) and (2) TOGETHER are not sufficient.
  

我的答案 E                   正确答案 D


请问若正确答案是D,怎么解释N=0这种情况，谢谢

吳縣大

0 is an integer, period.
integers include negative integers, 0, and positive integers