I believe it is Point of view since it has an explanation of a character or an observer
It is called an adverb. I hope this helps. :)
Your answer should be C , words such as “before” “then” “next” “after” stuff like that
His breathing became heavy
You'll have to be somewhat more specific with regards to what form of transformation you refer to. Shaper shifter, red riding hood and the wolf, multiple personality disorders, serial killer etc... The one common thread in this context is that appearances are always deceiving so it is always wise to be on your guard in any given situation because absolute safety is an illusion.