Choice "D" is correct. The manufacturer's attempt to appeal to prestige, performance, and safety targets a broad range of motivations in the automotive market and markets to wealthy individuals, corporations, etc. The manufacturer seeks to differentiate itself from other vehicles with various superlatives, however, there is not one feature that is specifically emphasized. The differentiation of the product is focused on a broad range of buyers.
Choice "b" is incorrect. Cost leadership focused on a broad range of buyers would emphasize price to a large number of buyers, not various features.
Choice "c" is incorrect. Cost leadership focused on a narrow range (niche) of buyers would emphasize price to a specific group interested in price.
Choice "a" is incorrect. Differentiation focused on a narrow range (niche) of buyers would differentiate the product within the context of a very few buyers and might specifically emphasize one feature such as prestige (for the status conscious professional), performance (for the auto enthusiast), or safety for families, etc.