1Cats are allowed to roam just about wherever they please (try and stop them), and even dogs have the run of the house, or at least of a portion of the house. 2But pet birds are generally limited for most of their lives to the space defined by the four sides of a small cage. 3Yet birds are born to flap and swoop through wide spaces of sky, unlimited neither by walls nor ceilings. 4To keep a creature born with wings in a small space, unable to use its major natural means of transportation, is unfair. 5People who want birds as pets should at least find ways to allow the birds to fly freely within one or two rooms of the house.

Question 1: The primary purpose of the passage is to

A - inform
B - persuade
C - entertain