The compound subject is "Young Juan and his father." Both Jaun and his father are the subjects of the sentence, but because there are two of them it means there is a compound subject.
Answer:
A. To persuade readers that the war should never happen.
Textual Evidence. ... But what does the teacher mean about citing textual evidence?' Let's answer that question next. Textual evidence is support for your analysis that comes directly from the text itself.