[GRE数学]If -m/19 is an even integer,which of the following mu

[GRE数学]If -m/19 is an even integer,which of the following must be true?问m是什么数.给出五个选项,分别是 A:negative number（负数）,B:positive number（正数）,C:prime number（质数） ,D:odd integer（奇数） ,E:even integer（偶数） .