I did some reading and what many say is that your in jeopardy of rescinding if you get a D or F. One or 2 C’s shouldn’t get more than a letter giving you advice for academic support while at Virginia Tech. But that is just people talking on what they have heard in past. I would be concerned as a transfer with 2 C’s. You definitely don’t want 3 C’s. I would work hard to at least get to 1 C - which I would think wouldn’t be a concern at all.
This is just my opinion doing a bit of reading - if you really want to know if your in jeopardy, the only real answer is call the admissions office and find out the expectations specific to you.
Here is one older thread on http://talk.collegeconfidential.com/virginia-tech/1751677-does-vt-ever-rescind.html