Personification is giving human traits to nonhuman things or organism.
In this case, the feathers are personified as being able to "dance", when obviously it isn't exactly "dancing".
~
I believe the correct answer is: a. Control of Phonation.
"Raspberries" are examples of sounds made in the control
of phonation stage of child’s language development. The control of phonation
stage (from 1 to 4 months old) is when the lips and tongue become more
coordinated with phonation, and child begins to say consonant-like sounds,
although these are not yet fully formed.
Blurring and adds depth to flat designs