Answer:
The part of the above excerpt from "To Kill a Mockingbird" by Harper Lee which is an example of a metaphor is:
2. "courage is a man with a gun in his hand".
Explanation:
A metaphor is a figure of speech. A metaphor is also a comparison but the comparison is made between two things which are very different for each other but posses one similarity in them. In the above sentence 'courage' is compared with 'a man with a gun'.