What is the primary purpose of a boutonniere?

The primary purpose of a boutonniere is to enhance the lapel of a suit or tuxedo. This decorative floral arrangement is traditionally worn on the left lapel of formal wear, such as suits and tuxedos, at events like weddings, proms, and other formal occasions. It adds a touch of elegance and style, complementing the outfit and allowing the wearer to express personal flair or connection to the event, such as matching the colors or themes.

The other choices do not align with the role of a boutonniere. It's not a decorative piece for the wrist, a necklace, or a table centerpiece, as those functions belong to other types of floral arrangements or accessories, which serve different purposes and are used in varying contexts. The specific placement and design of a boutonniere highlight its function as part of formal attire, making choice B the most accurate.