Final answer:
Roger's long pause after Mrs. Jones mentions she would have given him money for shoes signifies his surprise and confusion over her kindness.
Step-by-step explanation:
In the story Thank You, Ma'am, when Mrs. Jones mentions that she would have given Roger money for shoes had he asked, his long pause can be inferred as a mix of surprise, being touched, and confusion. This reaction suggests that Roger is not accustomed to such kindness and doesn't know how to respond. His silence reflects disbelief and perhaps a moment of self-reflection, as he considers the unexpected generosity of Mrs. Jones in contrast to his actions.