The stage of new product development in which potential customers are presented with a written or oral description of the product to determine their initial attitudes and buying intentions is called

concept testing

Explanation:

The stage of new product development in which potential customers are presented with a written or oral description of the product to determine their initial attitudes and buying intentions is called concept testing.

Because:

The product developer needs to ask a group of people for their opinion about a new product or advertisement before offical lauching the their product in other to minimise failure rate