Write the next sentence in the following story.

How to encourage doves to coo
Listen for the different dove calls.
If you have wild doves in your backyard or pet doves that you keep indoors, you may be able to differentiate some of the calls. Some of the calls are uttered by the male as part of the mating process, such as " coooooo-woo-woo-woo.

pick from the following.
[A]. " this means that when the doves chirp a call, they typically carry their attempt at coo sound. Doves can sing a chant or other cycle of particular sounds..
[B]. " You may also hear a long-drawn-out " coo " noise from breeders, especially if the doves are related to each other. Offer them a place to coo..
[C]. " Every type of dove has a unique call. Mourning doves have a sad, mournful call..
[D]. " Don't be mistaken for pigeons. You have to watch the male pigeons' behavior to judge whether or not they're doing what they normally do in their nest... The answer should be
[C].