一道11月2日math机经的疑问

3.       k and m are consecutive even number, does k > m?
                

(1)    k+2 and m-2 are non-consecutive even number
                

(2)    k-1 and m+3 are consecutive odd number
                

D
                

请教一下思路,为什么(2) 也成立?

请教一下思路,为什么(2) 也成立?