Question

The frog rolled in everyone felt cold.

A. Fragment

B. Run-on

C. A complete sentence

Answer 1

This is A. Fragment

Hope this helps.

Answer 2

I am assuming you mean 'fog'.  This is a run-on sentence.  The first sentence would be, "The fog rolled in," where the fog is the subject and rolled in is the predicate.  "Everyone felt cold," is the second sentence where everyone is the subject and feld cold is the predicate.