Isabella wants to amuse dragons and unicorns by giving them joke books. she wants to amuse a total of at least 14 dragons and unicorns (condition a), with 108 joke books at most (condition b).

the graph represents the constraints on the number of dragons d and unicorns u isabella amuses.

isabella amuses 222 dragons. how many unicorns can she amuse to meet both her constraints?
choose 1
choose 1

(choice a)
a
isabella doesn't have enough joke books left to amuse any unicorns.

(choice b)
b
at least 14 unicorns and at most 18 unicorns.

(choice c)
c
exactly 15 unicorns.

(choice d)
d
at least 12 unicorns and at most 15 unicorns.