Answer:
A. To encourage feelings of responsibility to continue fighting for the cause.
Step-by-step explanation:
The main reason why Lincoln gives the Gettysburg Address is to honor the soldiers who perished at Gettysburg in the past. However, the approach he takes is that of comparing the sacrifice of these men to the one of present soldiers. Lincoln wants to connect the two by arguing that both sacrifices are guided by a deep love for the country and a commitment to liberty. By linking these, he is able to encourage feelings of responsibility among his audience.