Birds can perch safely on overhead electric power cables without being electrocuted because
-
A.
birds can withstand high p.d. of the electric power cables -
B.
any accumulated charge on the birds is quickly dissipated -
C.
the feet of the birds are well insulated -
D.
the current is a.c. and has particular direction -
E.
there is no p.d between the birds and the cables