Answer :
The correct answer is C. They cry out because the path they have been walking is torturous.
Explanation:
1. In the stanza, the speaker expresses that despite smiling and singing, their cries arise from tortured souls.
2. The mention of the clay being vile beneath their feet and the length of the mile suggests a sense of struggle and suffering.
3. The use of words like "tortured" and "vile" conveys the idea of hardship and difficulty along the path they are walking.
4. This summary captures the essence of the stanza by focusing on the theme of suffering and the challenges faced by the individuals described in the passage.