!!! please help, i will give brainlist!!!

Hey there!
Basically, we have to double the number of times she hits the drum because the amount of time doubled.
9 * 2 = 18 (seconds)
15 * 2 = 30 (beats)
Therefore, she strikes the drum 30 times in 18 seconds, the correct answer is A
Hope this helps you!
God bless ❤️
xXxGolferGirlxXx
The time doubled (9 * 2 = 18) so we have to do the same thing with the beats:
15 * 2 = 30
The correct answer is A, she will strike the drum 30 times in 18 seconds
Hope this helps
-AaronWiseIsBae