Which of the following is a type of product extension?

The selection of line extension as the correct type of product extension is based on its definition and application in marketing. A line extension occurs when an existing brand introduces a new product variant within the same product category. This could involve changes such as new flavors, sizes, or other variations of an existing product that caters to different customer preferences while still maintaining the core brand identity.

For example, a beverage company that offers a popular cola might introduce a diet version or a cherry-flavored variant. This strategy allows the brand to leverage its established reputation and customer base, potentially leading to increased market share and consumer interest without the need to invest in entirely new brand development.

In contrast, the other options reflect different marketing strategies. A service extension involves expanding services offered alongside the product but does not directly modify or extend the product itself. A distribution extension refers to expanding the channels through which a product is sold rather than changing the product in any form. Market extension would involve targeting new customer segments or geographic areas with the existing products, which again differs from altering the product lineup itself. Thus, line extension specifically aligns with the concept of enhancing a product line within an existing brand framework, making it the correct choice in this context.