Would be great if someone can confirm if both the angles would be 90 degree here and hence the answer would be ‘c’
Not necessarily
Can you please elaborate?
Because for FE and BC both to be perpendicular AD also will be perpendicular. Similarly BC would be perpendicular to FB
Why?
But the answer is ‘c’. Finally understood why - Its because <EFB + <FBC = 180 (due to quadrilateral) and <EFA + <ADE = 180
Using both the equation - <ADE = <ABC
lnstead of solely focusing on the right answer, you should focus on rectifying your previously incorrect deduction (are two of the angles necessarily 90). If you understood what i said then sure. As you may have inferred from my picture above, it’s not the case that \overline{BC} \parallel \overline{AD}. Thus \angle ADE isn’t necessarily 90^{\circ}.
Yes make sense, thank you 
Do you have suggestion on which material should I practice to improve my geometry skills?
I think it depends on how much time you have to spend on geometry alone. If you have like 2 weeks to a month then Introduction to Geometry by AOPs is pretty good. You’re probably guaranteed to be able to solve every gre geometry question post that exposure though.
If your question was more so on geo resources you can use in gregmat then i’m not really sure, but a staff member should be able to guide you with that.
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