Which of the following is an example of vertical integration?

A cosmetic company collaborating with worldwide retailers to market its product.

Explanation:

B would be a plausible answer, but there is no actual purchase going on there.  The stores are not buying the cosmetic company or vice versa.  Therefore, even though they are part of the same supply chain this is not vertical integration.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.