We know that: $x + y < 180$ (since sum of all 3 angles of a triangle equals $180^o$)

Quantity A: $358-2(x+y)$
Quantity B: $180-(x+y)$

We need to compare:

$358-2(x+y)$ VS $180-(x+y)$

Adding $2(x + y)$ to both sides:

$358$ VS $180 + (x+y)$

Since $(x+y) < 180$, we have: $180 + (x+y) < 180 + 180 = 360$

Thus, we need to compare:

358 VS Quantity less than 360

# Quantity B here could be 359 => Quantity B is greater than Quantity A

# Quantity B here could be 358 => Quantity B is equal to Quantity A

# Quantity B here could be 357 => Quantity B is smaller than Quantity A

Thus, there is no relation

Answer D