Hi Sabishhek44

Successor - A successor route (think successful!) is the best route to a remote network. A successor route is used by EIGRP to forward traffic to a destination and is stored in the routing table. It is backed up by a feasible successor route that is stored in the topology table-if one is available.

Feasible successor - A destination entry is moved from the topology table to the routing table when there is a feasible successor. A feasible successor is a path whose reported distance is less than the feasible distance, and it is considered a backup route. EIGRP will keep up to six feasible successors in the topology table. Only the one with the best metric (the successor).is placed in the routing table. The show ip eigrp topology command will display all the EIGRP feasible successor routes known to a router.

The best route is determine by your metric to each network or device.

Regards

Andre

http://www.cisco.com/application/pdf/paws/13677/19.pdf

This means that, even if variance is set to 3, the E−D−A path is not selected for load balancing because Router D is not a feasible successor.