Which of the following is not considered a potential resource weakness?

A diverse product line relative to competitors is not considered a potential resource weakness because it indicates a company's capability to offer a range of products that may appeal to various customer segments. This diversity can be a strategic advantage, allowing the company to cater to different market needs, reduce risk through product differentiation, and leverage economies of scale.

In contrast, ineffective marketing campaigns, lack of a comprehensive functional strategy, and higher operational costs than rivals all represent weaknesses that could hinder a company’s performance or competitive position. Ineffective marketing can result in poor brand visibility and customer engagement, while a lack of a functional strategy may lead to disjointed operations and inability to execute effectively. Higher operational costs compared to rivals can erode profitability, indicating inefficiencies. Thus, option D stands out as a factor that enhances competitiveness rather than detracts from it.