keyhole problem help!!

[RING12]

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View attachment keyhole.doc

answer is E!

 

[A6project]

i think you need see it from the top and imagine it moves down through the hole.
Although the bar(connecting par) has angles, it is looks like a rectangle from the view. (the end of the bar was raised, but not moved front or back).
Definitely a tough question. I would def skip this and try to redo it once i do all the problems! 🙂