Final answer:
The sentences indicating Jimmy Valentine's commitment to change are the one where he gives away his burglary tools signifying the end of his criminal activities and the sentence highlighting his earned respect in the community, which marks a new beginning. Both option b and c are correct.
Step-by-step explanation:
To determine which two sentences from the excerpt support the idea that Jimmy Valentine has left his old life behind, we need to look at key elements that indicate a change in his character and lifestyle. The most telling details would be those showing that he has adopted a new, honest life and is engaged in positive relationships and activities that contrast his past criminal activities.
The sentence 'C. "I want to make you a present of my kit of tools. I know you'll be glad to get them... But she stands good and I'm going to marry the finest girl in the world.' effectively indicates that Jimmy has turned over a new leaf; he is giving away the tools of his former trade as a safecracker, which symbolizes the end of his criminal life. Moreover, his plan to marry reinforces his desire for a normal, upright life.
Another supportive sentence is 'B. At the end of a year, the situation of Mr. Ralph Spencer was this: he had won the respect of the community...' This sentence highlights that Jimmy, now living as Ralph Spencer, has earned the community's respect and is leading a successful, law-abiding life as a shoe store owner, which is a sharp departure from his criminal past.