The main point conveyed by the closing sentences from "My Old Home" is:
B. When many people hope for a thing, it is more likely to be realized.
The analogy used in the closing sentences suggests that hope is comparable to roads being formed on the earth. Just as roads are created when many people pass over the same path, the implication is that when many individuals share a particular hope or aspiration, it becomes more likely to be realized or achieved. The idea is that collective hope and the collective action that follows increase the chances of desired outcomes.