(a) E
(b) Z
(c) E, E 
(d) Z, Z

Assign priority to groups bonded to sp2 carbon  using CIP rules .Here atom with high atomic weight will get higher priority ..check atom by atom and assign priority on the very first difference in atomic weights.
Same priority group on the same side of the plane ---- Z

Same priority group on the different side of the plane ---- E

Ok now i understood this question very clearly thank you madam.