Question

prototypes are designed to determine a product’s feasibility. in this context, feasibility means: popularity. the skills required. an ability to be built. the cost of production.

Explanation:

Feasibility in product - design context refers to whether a product can be built. It's about the practicality of bringing the product concept to reality. Popularity is about how well - liked a product is, skills required is about the expertise needed for production, and cost of production is about the financial aspect. But the core of feasibility here is the ability to be built.

Answer:

an ability to be built.