Answer:
d) to give a sense of importance to the occasion
Step-by-step explanation:
Formal diction is rarely used to connect. Most of the times, formal diction is used to pass an idea of respect or professionalism. It can be less emotional, but it doesn't mean that it is. And it might not be the best way to express anger as well. The use of formal language, though, creates a serious tone to whatever you might be saying. Given the occasion, it is most likely the reason behind Lincoln's use of formal language.