Using the level of the product hierarchy to market its soups, campbell soups feature the company name first, then the soup variety on their packaging.

product-line level

Explanation:

A product line refers to the marketing of the products which are related to the same brand name. The items are sold by the same company. Various products are sold under multiple product lines to increase the sale of the products. The product lines help in the distinction of the products from each other. Introduction of the product lines is a method of encouraging the sale of the products by the companies.

answer(b); ; ; the quantitative or qualitative variable for which the experimenter wishes to determine how its value is affected by the explanatory variable;