firm's product mix Blank______ represents the number of product lines offered by the firm.Multiple choice question.depthbreadthcategorybrand

The correct term that represents the number of product lines offered by a firm is "depth."

Explanation:

1. Depth refers to the variety of products within a single product line. Hence, the focus here is on how many items are available in each line.
2. Breadth refers to the number of different product lines a company offers, not the number of products within those lines.
3. Category generally refers to a classification, and brand relates to the specific identity of products, rather than the number of product lines.

Therefore, in the context of this question, "depth" is the most accurate choice pertaining to the number of product lines.