Find the statement that must be true according to the given information.

For three years, Erin has been asking her parents for a dog. Her parents have told her that they believe a dog would not be happy in an apartment, but they have given her permission to have a bird.

A) Erin's parents like birds better than dogs.
B) Erin does not like birds.
C) Erin and her parents live in an apartment.
D) Erin and her parents would like to move.