Answer:
D. Global markets for standardized consumer products have emerged on a large scale of magnitude
Explanation:
According to Levitt, the development of internet and social media make it really easy for the customers to research the quality of products that hey about to buy. Along with it, the company's ability to market their product to customers world wide become really cheap.
The combination of the two make global markets for consumer products became massively increase. This means that each companies have to ensure that their products cater to the biggest market segmentation as possible if they want to maximize their profit.