Which of the following areas is noted for its viticulture in British Columbia?

British Columbia has several regions recognized for their viticulture, with both the Gulf Islands and Vancouver Island noted for their wine production. The Gulf Islands, which include places like Salt Spring Island, have developed a reputation for boutique wineries that produce high-quality wines, often focusing on cool-climate varietals. This region benefits from the temperate climate and maritime influence, which are conducive to growing grapes.

Vancouver Island, too, is recognized for its unique terroir that allows for the cultivation of a variety of grape types. The island's moderate climate and diverse soils contribute to a growing number of wineries that focus on both traditional and innovative winemaking practices.

Choosing both the Gulf Islands and Vancouver Island encapsulates the diversity of British Columbia's wine regions and highlights the significance of each area's contributions to the province's overall viticulture. In contrast, Prairie Valley is not primarily known for viticulture, making the inclusion of both A and C the correct choice. This combination reflects a broader understanding of British Columbia's winemaking landscape, which is not limited to one single area.