Answer:
Logos
Step-by-step explanation:
These lines from the Declaration of Independence are an example of the use of Logos.
Logos is the principle of reason and judgment. This appeals to the reader's sense of logic or reason.
From the excerpt, the speaker is using logos to appeal to the reason and judgment of the readers here:
"a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation.”