The correct answer is A. Say's Law
Explanation:
Say's Law proposed by the economist Jean-Baptiste Say establishes the supply (availability of a product) or the production itself is the factor that creates demand (customers willing to buy the product). For example, the production of a new model of cellphone or computer makes people want to buy the new model. This idea is expressed by the quote "If you build (produce] it they will come [purchase]" because in the quote it is explained the production of something make people go to buy that product.
