In the Harry Potter books, what are silver arrows and firebolts?

by Who Wants To Be A Millionaire?

In a Facebook poll of 94 respondents, 52.1% chose “B: Broomsticks”. How we count

B: Broomsticks
52.1%
C: Magic Spells
27.7%
A: Comets
10.6%
D: Wands
9.6%
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