*fast* which point is lincoln trying to make

Consecrate means to mark something as Holy or sacred. Hallow is a synonym of that. If you apply this to the text, then Lincoln is saying, "We cannot mark this land as Holy, because the souls of those who died have already done so, and we can neither add to it or take away from it."

Your answer is the last option.

awnser:

over the two days of the convention, presided over by lucretia’s husband james mott, the declaration of sentiments was read and its resolutions debated. the ninth resolution continued to be the most controversial, particularly because the attendees were predominantly quaker, and quaker men often declined to vote. freed slave and newspaper editor frederick douglass argued for approval of the resolution and convinced the audience of its necessity. at the end of the convention, about 100 of the attendees signed the declaration, although some removed their names later due to criticism.