The answer’s A. However, than can only be done when we assume that the line being extended from c, forming y, is consistent and the same line as BC. Given the fact that it is a QC question where it’s advised to NOT assume anything, why is the answer A and not D? Thanks, cheers!
The only assumption not allowed is that the figures are drawn to scale
Rest everything you can believe
If you see a line, treat it like a line (not some weird squiggle)
Try a few question the Big Book with this in mind, you will see that you will be fine
“Geometric figures are not necessarily drawn to scale. That is,
you should not assume that quantities such as lengths and angle
measures are as they appear in a figure. However, you should
assume that lines shown as straight are actually straight, and
when curves are shown, you should assume they are not straight.”
From the GRE Math Convention Booklet
Understood, thanks!