Answer:
1. The snow most likely symbolizes peace.
2. The theme symbolized by this expression is that of Reconciliation.
Explanation:
The description of the disagreement between the couple in this story showed a heated atmosphere prior to the onset of the snow. When the snow began to fall, peace returned between the couple. They were then able to talk about their misunderstanding and peacefully resolve them.
The theme symbolized by this expression is that of Reconciliation. Reconciliation is the act of resolving disputes. Initially this was not possible, but the onset of the snow made it feasible.
In McCain's words from the book's introduction: It is your character, and your character alone, that will make your life happy or unhappy. That is all that really passes for destiny. And you choose it. No one else can give it to you or deny it to you.
The phrase modified by the prepositional phrase in the sentence is B. Everyday.