Select the one which is different from other alternatives.

Options

A. `1, 2, 4, 7 `
B. `2, 3, 4, 9 `
C. `3, 2, 4, 8`
D. `4, 2, 3, 9`

Answer

A

Explanation

`1overset(+1)to2 overset(+2)to4 overset(+3)to7`
`2 overset(+1)to3 overset(+1)to4 overset(+5)to9`
`3 overset(-1)to2 overset(+2)to4 overset(+4)to8`
`4overset(-2)to 2 overset(+1)to3 overset(+6)to9`