If bcde is congruent to opqr, then de is congruent to (options are attached)

This congruency thing is all about corresponding sides and angles.  In quadrilateral BCDE and OPQR, DE and QR are in corresponding positions.  You don't even have to draw them out to see that.  Just like you can say that angle B and angle O are corresponding, and side BC is corresponding to side OP.  Match them up; that's all there is to it!

Oh yeah yeah the answer is oh yeah yeah

Ithink it’s b, hope this .