Hello. You do not present the excerpt to which this question refers, which makes it impossible for it to be answered. However, I will try to help you in the best possible way.
It is only possible to know the tone of an excerpt after reading it. However, the tone of a text refers to the feeling that an author intends to convey to the reader through reading. In this case, to answer your question, you must read the excerpt and identify whether the author has a happy, sad, stressed, apprehensive tone, among others. This can be identified through the situation in which the excerpt is presenting. For example: The excerpt will have a sad tone if it presents a sad situation, such as the death of someone, the suffering of some character, among others. Likewise, the excerpt will have a stressed tone, if it presents a stressful situation such as economic problems, a character fleeing from danger, among others.