It depends on how they stare. For example, they get excited when they see you, and move their tails, also moving their tails can mean either they are happy or scared
I'd say the answer is C because that doesn't really narrow down what he is trying to write about. he needs a more complex question for research.
Are you asking about our confession or is this a passage ?
(not meaning to take points, i'm sorry, just not sure ?)