Final answer:
To apply a filter nondestructively, the correct action is to duplicate the layer. This preserves the original layer for future revisions and adjustments.
Step-by-step explanation:
To apply a filter nondestructively so you can change your filter settings later, you would B) Duplicate the layer. By duplicating the layer before applying any filters, you preserve the original layer and its contents, which allows you to revisit and adjust the filter settings without permanently altering the original image. This approach gives you flexibility and greater control over your editing process. It's a common practice in photo editing and graphic design software such as Adobe Photoshop.