Which sentence is an example of formal language?

Which statement best supports the author's purpose in "children of the drug wars," which is to persuade readers that the united states should do more to immigrant children from honduras?

Read the sample student claim and the reasons listed for making this claim. claim: although many people argue that medical testing on animals is a violation of animal rights, the benefits it yields for society far outweigh any argument that can be made. reason #1: animal research has yielded both pain-relieving and life-saving drugs for humans. reason #2: laws prohibit scientists from using animal-based research in cases where non-animal testing would produce equally clear and valid results.

How does the poem's mood and tone change in each of these stages of “o captain! my captain! ” by walt whitman? (i need an answer asap )