Answer:
kinda late but the answer is B
Hope this helps!! <3
The zeros of the given functions are shown on the attached picture.
SOLUTIONS
Solve a given equations or algebraic symbols?

(A)

(B)

(C)

(D)
Arrange in ascending order:-
6 7 11 13 14 15 15 19 21
median = 14
lower quartile = mean of 7 and 11 = 9
upper quatile = mean of 15 and 19 = 17
Interquartile range = 17 - 9 = 8
answer is 8