One of the factors of is

Correct option is A

To factorize the expression , we can rearrange the terms and use the difference of squares formula:
= x2 - 2xy + y2 - z2
= (x - y)2 - z2
Now, we can use the difference of squares formula again:
= (x - y + z)(x - y - z)
Therefore, one of the factors of = x - y + z