After analyzing the phrases "bore her part" and "sudden heroism" in the passage, we can say they affect the tone in the following manner:
A. The phrases convey approval for the martyr Madame Loisel has become.
Madame Loisel is the main character in Guy de Maupassant's story "The Necklace." At first, she is described as a woman frustrated at her social status. She wishes she were richer so that she could have nice things.
After losing the necklace she borrowed from a wealthy friend, Madame Loisel has to buy a new one to replace it. Surprisingly, instead of complaining, she works hard to pay for the new necklace. Her social status declines, she begins to wear poor clothes, but does it with heroism.
The narrator is conveying approval, describing Madame Loisel as a martyr. Martyrs are those who do not complain when suffering, who bear their cross without uttering a word. Thus, the best answer is letter A.
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