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The correct answer is - The children’s innocence touches the volunteers’ hearts.
Pathos as a rhetorical appeal should affect your emotions by using poignant themes such as the children's innocence. The other options give you facts rather than feelings, and are thus using ethos rather than pathos. By using pathos, you want to make your audience feel things and therefore agree with your points.
That would be D, marks the split between the two sentences forming the compound sentence.
