Answer:
Tossing their heads
Step-by-step explanation:
"sprightly" meanings like an elderly person dancing or lively and suddenly movements.
Basically choose the one that's like moving or dancing.
-I know it's not "stars that shine" because i don't think stars dance or really move in those ways
-I know "ten thousand saw i" honestly has nothing to do with move at all
-I know "twinkle on the milky way" is so not the answer it just sounds like someone decided to go potty on the milky way:/