Answer: Product use
Step-by-step explanation:
According to the given question, the primary segmentation variable in the given Bethlehem steel corporation is best illustrating the example of product use as this steel corporation is basically preparing their product on the basis of the customer requirements.
The product use is one of the business segmentation process which is basically use on the basis of analysis of the data given by the customer or any users.
This concept helps in analyzing the actual requirement and the performance of the product in the market so that the companies are manufacturing the products on the basis of proper analyzes.
Therefore, Product use is the correct answer.