If zy < xy < 0, is |x - z| + |x| = |z| ?
(1) z < x
(2) y > 0
from i, x and z both are -ve. if they were +ve, then yz would be greater than xy but the given information is just reverse of that. so x and z both are -ves. now we can say that
|x - z| + |x| = |z|. suff.
from ii, y >0 meant x and z are -ve. again suff.
so got D.