Answer:
BE and DF are the skew lines .
Option (C) is correct .
Explanation:
Definition of skew lines
skew lines are those two lines that do not intersect each other and are not parallel.
As shown in the figure given in question .
BE and DF are the lines that do not intersect each other and are not parallel.
Therefore BE and DF are the skew lines .
Option (C) is correct .