E1 is correct
E2 is wrong why??
because in RHS of E2 we have string 000 but LHS does not have 000 so it is false
E3 is wrong why ??
because from LHS of E3 we can generate 101but in RHS OF E3 we cannot generate it so it is false
E4 is true because LHS= RHS
so A) option answer .