We can consider multiple cases here to solve this question.

Case 1:
When x = 1 and y = -1:
Quantity A = xy = (1) * (-1) = -1

Quantity B = x + y = (1) + (-1) = 0

Quantity A < Quantity B

Case 2:
When x = 5 and y = -1:
Quantity A = xy = (5) * (-1) = -5

Quantity B = x + y = (5) + (-1) = 4

Quantity A < Quantity B

Case 3:
When x = 5 and y = 4:
Quantity A = xy = (5) * (4) = 20

Quantity B = x + y = (5) + (4) = 9

Quantity A > Quantity B

Case 4:
When x = -25 and y = -4:
Quantity A = xy = (-25) * (-4) = 100

Quantity B = x + y = (-25) + (-4) = -29

Quantity A < Quantity B

So, we can see that for different values of x and y, the quantities can behave differently.

Hence, the correct answer is Option D).