(B) pronoun
A simple subject can either be a noun or a pronoun.
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Answer:
Tone.
Explanation:
Tone, in literature, can be defined as a feelins or emotions presented by a speaker or writer in a text, whether written or oral.
Tone helps to identify the emotions or feelings an author or speaker if feeling at the moment. A tone of the text can be joyful, happy, sarcastic, humorous, sad, melancholy, etc.
Similar to our tone of voice, tone in text works. It helps to identify if the speaker or writer is angry or serious about something. While listening a text, tone is more clearly identified.
Thus the correct answer is tone.