The correct answer is C. whining.
Barking is a loud, sharp sound that dogs make to communicate with each other and with humans. Crying is a high-pitched sound that humans make when they are sad or in pain. Whining is a low-pitched, continuous sound that dogs make when they are anxious, scared, or in pain. Sobbing is a loud, gasping sound that humans make when they are crying very hard.
In the context of the question, a stray dog kept whimpering all night. This suggests that the dog was anxious or scared, and was trying to communicate this to someone. Whining is a common sound that dogs make when they are feeling this way, so it is the most likely answer.
Barking is also a common sound that dogs make, but it is usually not associated with anxiety or fear. Crying is a sound that humans make, and it is not typically associated with dogs. Sobbing is a very loud and intense sound that humans make when they are crying very hard. It is not a sound that dogs typically make.
