This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to care for your canary
Buy a big cage.
Canaries like to fly from side to side, making it important that you have a very wide, but not necessarily tall, cage. For one canary your cage should be about 16 " tall and 30 " wide.

Choose from: I. The larger the cage, the better for the canary. Be sure that the area you put the cage has good light and ventilation, without a draft.. II. This shape is ideal for you as the bird can hop in and reach things with its head. But if you are able, opt for an " animal cage " instead.. III. For two birds, find a screen door of 16. 4 " or smaller and apply wax paper on it.. IV. Each canary should be bound to a cage at least eight feet in height. Check the quality of the housing for the eggs..
The answer is:
I.