O A “Then the son, with rapid fingers, fumbled in the packet of letters, took another of them and read" ( Paragraph 26)
OB “The nun, straight as a statue, with teardrops standing at
each corner of her eyes, looked at her brother. waiting to see
what he meant to do." ( Paragraph 29)
OC "He went over to the drawer and flung in the letters which
he had picked up from the floor. (Paragraph 31)
D "without even a parting glance at the mother whom he had
separated from them and condemned, he said slowly: Now,
my sister, let us leave the room." ( Paragraphs 32-33)

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D "without even a parting glance at the mother whom he had

separated from them and condemned, he said slowly: Now, my sister, let us leave the room." ( Paragraphs 32-33)

Explanation:

To answer this question, one must first read "A Dead Woman's Secret" (1880) by Guy de Maupassant. Then, there´s the first part of the question, which asks: "how do the siblings’ reactions to their mother’s letters contribute to the theme of the text?

The answer to the first part is:

A. The siblings are shocked, contributing to the theme that people are not always as they seem.

Part B of the question is: "Which of the following quotes best supports the answer to Part A."

Only option D, allows us to understand how shocked both siblings are, as they both leave their mother after finding out about her lover.