Gloria notices an article that she thinks would interest her husband. she emails it to him, and they discuss it later at dinner. this is an example of which of gottman's marriage principles?

The answer is "building Love Maps".

The rule of building Love Maps is just this, knowing the easily overlooked details about your accomplice's life makes a solid establishment for your companionship and closeness. 
Dr. John Gottman has discovered that sincerely insightful couples are personally comfortable with each other's universes. He calls this having a lavishly point by point Love Map – his term for that piece of your cerebrum where you store all the applicable data about your accomplice's life.