A vSphere 5 implementation consists of a fully automated DRS cluster with the following vNetwork Standard Switch configuration.

1. Switch A: two vmnics, one port group named sFTP-PG

2. Switch B: one vmnic, one port group named Web-PG

3. All vmnics are trunked to the same physical switch

DRS has been configured with an anti-affinity rule for all virtual machines in the Web-PG so that no more than half of the virtual machines run on any given host. The virtual machine on WebPG are experiencing significant network latency. The network team has determined that a performance bottleneck is occurring at the ESXi host level.

Which solution will require the least amount of administrative work and least amount of service interruption?

A.
Move a vmnic from Switch A to Switch B on each host.

B.
Migrate Web-PG to Switch A and sFTP-PG to Switch B on each host.

C.
Convert the three Switcg Bs to a single vNetwork Distributed Switch.

D.
Use vMotion to redistribution some of the VMs in Web-PG to a different ESXi host.

Explanation:
(Explanation ):

So let us examine this is a problem with resource contention on a NIC on a host. VDS WILL NOT FIX the problem because dvuplinks are the same as uplinks on the ESX host experiencing a problem.
B should be incorrect, you cannon migrate networking on a VSS
VMotion should not be a solution, DRS already has VMotion and knows where to place VMs using defined rules.
I think it should be A