Answer:
The correct answer is letter "B": adding a new private-label product.
Step-by-step explanation:
A product line refers to the variety of goods and services an organization can offer. The product line depth represents the number of products in the product line. That product line depth can be one good or one thousand goods. When the company has many product lines, we are talking about the firm's product line width.
Thus, if a company pursues to increase its product line depth, it is not suitable to add a private-label good since it will limit the number of products in line depth.