Gregor's sudden transformation into a giant insect
To survive and not getting in trouble and trying to find his way home
' C ' has the misplaced modifier. It makes the sentence sound like the commands take the obedience class.
It should say "The dogs that take the obedience class know several commands.".
It's to separate 2 independent clauses.
The theme is the central message in a literary work!
Hope that helped, even though it was slightly late :D