To answer your questions from my experience

A) No

B) No

C) No. However if your syslog is getting a lot of UDP packets you may want to disable that VM from VMotion, as you may loose a few packets as the networking switches. If its tcp that there will not be loss.

Should be easy for you to setup some load tests for your environment, which is the only way you are going to be sure.

Considering awarding points if this is of use