we know that
skew lines are two lines that do not intersect and are not parallel
therefore
case a) EF, DH, FH, AB
is not the solution, because DH is parallel to GC
case b) BD, AB, EF, FH
is the solution, because the four lines, do not intersect and are not parallel to GC
case c) BD, EF, AC, FH
is not the solution, because AC intersect to GC
case d) FH, EA, AB, EF
is not the solution, because EA is parallel to GC
the answer is the option
BD, AB, EF, FH
