The author’s use of the word "silence" affects the tone by suggesting that the owners would not tolerate protests. This aligns with the interpretation that "silence" has a negative connotation in this context, as it implies oppression and the suppression of voices and actions against the injustice faced by the enslaved people. The owners' desire to achieve silence through fear underscores the harsh and oppressive conditions of the enslaved, reinforcing a tone of resistance against tyranny. Therefore, the most accurate answer is:
Silence has a negative connotation, indicating that the owners would not tolerate protests.