Babies usually cry when nobody takes care of their needs. Most of us have experienced this kind of baby crying. Luckily, it is no longer a problem. Now we have baby sign language. It gives us a chance to get to know a baby’s world so that we can share their joy and really understand them. It also makes the baby and its family closer.What’s more, according to the study, signing acts as a bridge to help babies improve language learning. In other words, babies who learn to sign can speak sooner and learn faster. Sharon, for example, learned her first 10 signs at age six months. Without shouting or crying, she could tell her parents how she felt when she was hungry, thirsty, or tired. She learned other 32 signs at age nine months. Signing helps her speak better than other children. How awesome the baby sign language is!
23 ( 　) After learning baby sign language, what did Sharon do when she was tired?
(A) She cried.
(B) She shouted.
(C) She signed.
(D) She spoke in a loud voice.