can you let me know where I went wrong here? I used y=10 and x=50 as a starting point (choosing numbers)

In the question, we are only given that AB || CD. Considering AD as the transversal, x = v.

But, we are not given BE || CF (according to your figure).

When they are parallel, w = y. This results in option C.

However, in other cases, w ≠ y. This results in option D.

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