The correct answer is A- it states it in the lesson :)
"The "garden of my childhood" that he refers to in the poem is a metaphor for China, the homeland that he must abandon."
Most speeches tend to last somewhere around 2-3 minutes so I would go with B. Traveling to Europe, meaning you have extensive knowledge and that leads to more things to talk about and explain
Yeah, if you really believe that what your believing in is right, never lose sight of it.