What is the value of $$\frac{x^2 + y^2 - z^2}{xy}$$?
I. x : y = 1 : 2
II. y : z = 2 : 3

A

If the statement I alone is sufficient to answer the question

B

If the statement II alone is sufficient to answer the question

C

If both the statements I and II are sufficient to answer the question but neither statement alone is sufficient.

D

If both the statements I and II together are not sufficient to answer the question and additional data is required.