This sentence illustrates a paradox in marketing, the contradiction between production orientation and demand orientation. Look at this sentence from the perspective of the times. Henry Ford is a leader in mass production. At that time, production decided to sell, and there were few homogeneous competitors. Because Ford is a pioneer in the automobile industry, he doesn't need to ask consumers what they need at all. Consumers themselves don't know what they need. The same reason as Apple products in the Steve Jobs era.

Back to the topic, I feel that these options are not very reliable, but I always choose one when I take exams. I tend to choose a, because the industrial products produced in the initial industrial era are still in the era when production determines consumption. Basically, it can only be sold by output, and producers decide the market. In this context, this sentence should be correct.

B, product development, completely out of the market, who knows what you have developed. B this sentence itself is wrong.

C, product development and novelty psychology are actually two concepts. From the marketing point of view, development is to keep the market interested in brands and products, while seeking differences is more about market segmentation and market segmentation. This sentence can only be established when it is necessary to enter the market segment. Option C has little to do with Ford's words on the topic.

Finally, d, it is said that consumers guide production, while Ford obviously has the confidence that production leads consumption, so it is not correct.