The word best contributes to the authors la sad tone is life. Thus the correct answer is A.
Why the tone of the author is sad?
In the given passage the subject is clarifying the difference between life and death which is considered a serious subject. Here authors discuss the graveyard which is quite emotional to remember the death of someone.
The tone of the author helps to understand the subject clearly and where it is gone. It helps to understand the mindsets of the writer whether, it is positive, negative, emotional, sarcastic, so on.
Therefore the correct answer is A life contributes to the sad tone of the author.
Learn more about tone, here:
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