Here is your answer
[tex]<b>/_D</b>[/tex]
REASON:
Since,
CDEF is congruent to MNPQ
So, its corresponding sides, corresponding angles and corresponding diagonals are equal.
Hence,
Sides- CD=MN; DE=NP; EF=PQ; CF=MQ
Angles- C=M; [tex]<font color="red">D=N</font>[/tex]; E=P; F=Q
Diagonals- CE=MP; DF=NQ
HOPE IT IS USEFUL
