The main idea of the text is that the reasons given by slavery supporters are relative, not universal
<h3>What is a Main Idea?</h3>
This refers to the central theme of a text that contains the message that an author or speaker wants to convey to his audience.
Hence, we can see that based on the complete text, President Abraham Lincoln gave a speech about the fragments of slavery and he talked about the issues with slavery and the points of pro-slavers were relative and not universal
Read more about main ideas here:
brainly.com/question/895081
#SPJ1
C.
The reason why is because it's talking about how much would it takes to make charcoal, which is a lot to yield so little charcoal. So, it's negative.