Answer: C. Mournful.
Step-by-step explanation: The tone of a story or a sentence is the author's attitude towards the audience, the subject, or even the characters of the story. There are many kinds of tones: positive, negative, happy, sad, angry, serious, etc. In the given passage we can see an example of a mournful tone, because we can see that the speaker is expressing sadness, grief and also he seems to be missing his birthplace and family.