Introduction:
In the story "How Much Land Does a Man Need?" by Leo Tolstoy, the author introduces Mrs. Dorling as a character during the war. When describing Mrs. Dorling for the first time, the author uses the phrase "a woman with a broad back."

Explanation:
The author's description of Mrs. Dorling as a woman with a broad back indicates her physical appearance and offers insight into her character. Here's a detailed explanation of why the correct answer is option 'A':

1. Physical appearance:
- The phrase "a woman with a broad back" suggests that Mrs. Dorling has a wide or large back.
- This description emphasizes her physical presence and may imply that she is sturdy or robust.

2. Symbolic meaning:
- The broadness of Mrs. Dorling's back can be seen as a symbol of her strength and resilience.
- In times of war, physical strength and endurance are crucial, and the author's choice of describing her back in this way highlights her ability to endure hardship.

3. Emotional strength:
- The image of a woman with a broad back also suggests emotional strength and stability.
- Mrs. Dorling may be portrayed as someone who can shoulder the burdens and challenges of war without breaking under pressure.
- Her physical appearance mirrors her inner strength, allowing her to face difficult situations with determination and fortitude.

4. Contrast to other characters:
- The description of Mrs. Dorling's broad back may also serve as a point of contrast to other characters in the story.
- While some characters may be depicted as weak or fragile, Mrs. Dorling stands out as a resilient and dependable individual.
- This contrast helps to highlight the unique qualities and attributes of Mrs. Dorling as a character.

Conclusion:
In the story, the author describes Mrs. Dorling as a woman with a broad back during the war. This description not only provides insight into her physical appearance but also symbolizes her strength, resilience, and emotional fortitude. By using this imagery, the author portrays Mrs. Dorling as a character who can endure and overcome the challenges of war.