I believe you are referring to Harriet Beecher Stowe's Uncle Tom's Cabin. One of Tom's last act is to forgive Quimbo and Sambo. Quimbo and Sambo were ordered by Legree to beat up Tom mercilessly. However, they realize their wrongdoing and decide to heal Tom's wound. Tom then tells them they can still be saved by Jesus' grace.
Answer: "By connecting the meaning with a symbol or image" and "Through indirect comments from the narrator".
Explanation: When you imply the meaning of something, you convey the message in a subtle, indirect or symbolic way. Having a character or the narrator point out the meaning is explanation, not implication.
Since the questions asks about when, you would expect that the supporting detail would contain a time or date. That sentence would be:
<span><em>It is believed that Boston terriers can be traced back to a dog named “Judge” who was sold to a man living in Boston named Hooper in 1870.</em>
Therefore, it happened in year 1870.</span>
