The answer is D) doubt. I know this because when you use context clues this the most understandable.
This is more like the compass for finding your way out of a geometry book. A mathematical compass (like this one) is used to draw perfect circles. For Donne, it was the perfect metaphor for the long-distance relationship he imagined with his wife. Line 26: The compass is introduced emphasizing two crucial features.
Is this referencing the roaring twenties?
A) Spendable income..... hope it helps :)