Final answer:
The correct choice for adding a border to a picture in Word according to the provided options is Gold Accent 2, darker 50%. This indicates a darker shade of the base theme color.
Step-by-step explanation:
When adding a border to a picture in Microsoft Word, the correct choice according to the options given in the question would be Gold Accent 2, darker 50%. This selection specifies a color that is a darker shade of Gold Accent 2 from the theme colors in Word. It's important to choose a border color and style that complements the content and design of the document. The 'Darker 50%' indicates that the base color Accent 2 should be darkened by 50% to achieve the desired look.
This meticulous consideration of color and intensity enhances the overall aesthetic cohesion, presenting a polished and thoughtfully crafted appearance to the document's graphical elements.