Which of the following brands specializes in activewear and pants?

The correct brand specializing in activewear and pants is DU/ER (Duer). This brand focuses on creating performance-oriented clothing using innovative materials, designed to provide comfort and functionality for activities ranging from casual wear to more active pursuits. Their product range includes a wide selection of pants that incorporate stretch fabrics and moisture-wicking properties, making them ideal for active lifestyles.

On the other hand, Duckworth is known primarily for its high-quality merino wool outerwear and base layers rather than specifically focusing on activewear and pants. Ed Hardy, while well-known for its graphic T-shirts and eclectic designs, does not focus on activewear but rather lifestyle apparel. Dunhill, or Alfred Dunhill, is a luxury brand that's primarily recognized for its high-end menswear and accessories, with less emphasis on activewear. Thus, DU/ER is the brand that aligns with the specialization in activewear and pants.